Full Length GRE Quantitative Reasoning Practice Test

Full Length GRE Quantitative Reasoning Practice Test

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GRE Quantitative Reasoning Practice Test 1

 

Section 1   20 questions Total time for this section: 35 Minutes You can use a basic calculator on this section.

1- a and b are real numbers. a<b
Quantity A Quantity B
|a  b| |b  |
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
2- 6 percent of x is equal to 5 percent of y, where x and y are positive numbers. 
Quantity A Quantity B
x y
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
3- x is an integer greater than zero. 
Quantity A Quantity B
1x + x 8
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
4-  
Quantity A Quantity B
The least prime factor of 55 The least prime factor of 210
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
5- Emma and Sophia have a family business. The profit of their business will be divided between Emma and Sophia in the ratio 3 to 4 respectively.;
Quantity A Quantity B
The money Emma receives when the profit is $560. The money Sophia receives when the profit is $420.
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
6- The volume of a sphere with diameter of length 5 is how many times the volume of sphere with diameter of length 5 ?
(Volume of a sphere =\frac{ 4}{3} \ π\ r^3) .
(A) \sqrt{5}
(B) {5}
(C) 10
(D) 10\sqrt{5}
(E) 5\sqrt{5}
7- What is the solution of the following system of equations?
 \begin{cases}-\ \frac{x}{2}\ +\ \frac{y}{4}=1\\ -\ \frac{5\ y} {6}\ +\ 2\ x=4\end{cases}
(A) x=48, \ y=22
(B) x=50, \ y=20
(C) x=20, \ y=50
(D) x=22, \ y=48
(E) x=22, \ y=50
8- If y=2^4 then what is the value of y^\sqrt{y}?
(A) 2
(B) 2^4
(C) 2^8
(D) 2^{16}
(E) 2^{32}
9- The average weight of 18 girls in a class is 60 kg and the average weight of 32 boys in the same class is 62 kg. What is the average weight of all the 50 students in that class?
(A) 60
(B) 61.28
(C) 61.68
(D) 61.90
(E) 62.20
10- If 60 \% of A is 20 \% of B, then B is what percent of A?
(A) 3\%
(B) 30\%
(C) 200\%
(D) 300\%
(E) 900\%
11- If (x\ -\ 2)^3=27 which of the following could be the value of (x\ -\ 4)\ (x\ -\ 3)?
(A) 1
(B) 2
(C) 6
(D) -\  1
(E) -\  2 
12- The average of x , y and 5 is 5 and x\ -\ y=-\ 8 What is the value of x\ ×\ y ?
(A) 9
(B) - \ 9
(C) - \ 8
(D) 8
(E) 0
13- The surface area of a cylinder is 150\ π cm^2. If its height is 10 cm, what is the radius of the cylinder?
(A) 13 cm
(B) 11 cm
(C) 15 cm
(D) 5 cm
(E) 7 cm
14- In the xy-plane, the point (4,3) and (3,2) are on line A. Which of the following equations of lines is parallel to line A?
(A) y= 3\ x
(B) y= 10
(C) y= \frac{x}{2}
(D) y=2\  x
(E) y=x
15- What is the product of the number of Mathematics and number of English books?
GRE_Quantitative
(A) 21,168
(B) 31,752
(C) 26,460
(D) 17,640
(E) 14,112
16- What are the values of angle α and β ?
GRE_Quantitative1
(A) 90^ \circ , 54^\circ
(B) 120^ \circ , 36^\circ
(C) 120^ \circ , 45^\circ
(D) 108^ \circ , 54^\circ
(E) 108^ \circ , 36^\circ
17- The librarians decided to move some of the books in the Mathematics section to Chemistry section. How many books are in the Chemistry section if now γ=\frac{2}{5}\ α?
GRE_Quantitative2
(A) 80
(B) 120
(C) 150
(D) 180
(E) 200
18- Let r and p be constants. If x^2\ +\ 6\ x\ +\ r factors into (x \ +\ 2)\ (x \ +\ p), the values of r and p respectively are?
(A) 8, 4
(B) 4, 8
(C) 6, 3
(D) 3, 6
(E) The answer cannot be found from the information given.
19- In how many ways can 5 cards be placed in 3 positions if any cards can be placed in any position?
(A) 5
(B) 10
(C) 15
(D) 30
(E) 120
20- If (x\ -\ 2)^2\ +\ 1\ >\ 3\ x\ -\ 1, then x can equal to which of the following?
(A) 1
(B) 6
(C) 8
(D) 3
(E) 4

GRE Quantitative Reasoning Practice Test 1

 

Section 2   20 questions Total time for this section: 35 Minutes You can use a basic calculator on this section.

21-  
Quantity A Quantity B
(-\ 5)^4 5^4
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
22- The average of 3, 4, and x is 3.
Quantity A Quantity B
x average of x,\ x\ -\ 6,\ x\ +\ 4,\ 2\ x
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
23- \frac{4}{5}<\ x\ <\frac{6}{7}
Quantity A Quantity B
x \frac{5}{6}
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
24- n is a natural number and \frac{1}{3^n} <\frac{1}{27}
Quantity A Quantity B
3 n
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
25-  
Quantity A Quantity B
\frac{ x^6}{6} (\frac{x}{6})^6
(A) Quantity A is greater.
(B) Quantity B is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
26-  
Quantity A Quantity B
5\ +\ 8\ ×\ (–\ 2)\ –\ [4\ +\ 22\ ×\ 5]\ ÷\ 6 [6\ ×\ (–\ 24)\ +\ 8]\ –\ (–\ 4)\ +\ [4\ ×\ 5]\ ÷\ 2
(A) Quantity A is greater.
(B) Quantity B  is greater.
(C) The two quantities are equal.
(D) The relationship cannot be determined from the information given.
27- If |a|<1, then which of the following is true? (b>0)?
I. –\ b<b\ a <b
II.-\ a<a^2<a if a<0
III.-\ 5<2\ a\ -\ 3<-\ 1
(A) I only
(B) II only
(C) I and III only
(D) III only
(E) I, II and III
28- The ratio of boys and girls in a class is 4:7. If there are 44 students in the class, how many more boys should be enrolled to make the ratio 1:1?
(A) 8
(B) 10
(C) 12
(D) 14
(E) 28
29- If 150 \% of a number is 75, then what is 90 \% of that number?
(A) 45
(B) 50
(C) 70
(D) 85
(E) 90
30- Removing which of the following numbers will change the average of the numbers to 6?
1, \ 4, \ 5, \ 8, \ 11, \ 12
(A) 1
(B) 4
(C) 5
(D) 11
(E) 12
31- The length of a rectangle is \frac{5}{4} times its width. If the width is 16, what is the perimeter of this rectangle?
(A) 36
(B) 48
(C) 72
(D) 144
(E) 180
32- The marked price of a computer is D dollar. Its price decreased by 20\% in January and later increased by 10 \% in February. What is the final price of the computer in D dollar?
(A) 0.80 D
(B) 0.88 D
(C) 0.90 D
(D) 1.20 D
(E) 1.40 D
33- In the following figure, what is the perimeter of ∆ ABC if the area of ∆ ADC is 15?
GRE_Quantitative3
(A) 37.5 
(B) 21 
(C) 15 
(D) 24 
(E) The answer cannot be determined from the information given
34- A line l is parallel to the x-axis and passes through the point (-3,4). What is the slope of the line (m) and its y-intercept?
(A) 𝑚=∞, y\ − intercept =4
(B) 𝑚=∞, y\ − intercept =-\ 3
(C) 𝑚=0, y\ − intercept =-\ 3
(D) 𝑚=0, y\ − intercept =4
(E) 𝑚=-\ 3, y\ − intercept =4
35- Between which two of the months shown was there a twenty percent decreased in the number of pants sold?
GRE_Quantitative4
(A) January and February
(B) February and March
(C) March and April
(D) April and May
(E) May and June
36- During the six-month period shown, what is the median number of shirts and mean number of shoes per month?
GRE_Quantitative5
(A) 146.5, 30
(B) 147.5, 29
(C) 146.5, 31
(D) 147.5, 30
(E) 146.5, 29
37- How many shoes need to be added in April until the ratio of number of pants to number of shoes in April equals to five-seventeenth of this ratio in May?
GRE_Quantitative6
(A) 90
(B) 80
(C) 70
(D) 60
(E) 50
38- What is the product of all possible values of x in the following equation? |x\ -\ 2\ x\ -\ 5\ +\ 7|=4
(A) 12
(B) -\ 12
(C) 6
(D) -\ 6
(E) 0
39- In the following figure, ABCD is a rectangle, and E and F are points on AD and DC, respectively and DE=4 and DF=3. The area of ∆BED is 16, and the area of ∆BDF is 18. What is the perimeter of the rectangle?
GRE_Quantitative7
(A) 20
(B) 22
(C) 32
(D) 40
(E) 44
40- In the following figure, ABCD is a rectangle. If a=\sqrt{3}, and b=2\ a, find the area of the shaded region. (the shaded region is a trapezoid)
GRE_Quantitative8
(A) 4
(B) 2
(C) \sqrt{3}
(D) 2\sqrt{3}
(E) 4\sqrt{3}
1- Choice C is correct

The correct answer is The two quantities are equal.
Choose different values for a and b and find the values of quantity A and quantity B. a=2 and b=3, then:
Quantity A: |2\ -\ 3|=|-\ 1|=1
Quantity B: |3\ -\ 2|=|1|=1 The two quantities are equal. a=-\ 3 and b=2, then:
Quantity A: |-\ 3\ -\ 2|=|-\ 5|=5 Quantity B: |2\ -\ (-\ 3)|=|2\ +\ 3|=5 The two quantities are equal. Any other values of a and b provide the same answer.

2- Choice B is correct

The correct answer is Quantity B is greater.
6\% of = 5\% of y → 0.06\ x = 0.05\ y→x=\frac{0.05}{0.06} \ y→x=\frac{5}{6}\ y, therefore, y is bigger than x.

3- Choice D is correct

The correct answer is The relationship cannot be determined from the information given.
Choose different values for x and find the value of quantity A.
x=1 ,
then: Quantity A: \frac{1}{x}\ +\ x= \frac{ 1}{1}\ +\ 1=2
Quantity B is greater x=0.1, then:
Quantity A: \frac{1}{x}\ +\ x= \frac{ 1}{0.1}\ +\ 1=10\ +\ 1=11
Quantity A is greater
The relationship cannot be determined from the information given.

4- Choice A is correct

The correct answer is Quantity A is greater.
prime factoring of 55 is: 5\ ×\ 11
prime factoring of 210 is: 2\ ×\ 3\ ×\ 5\ ×\ 7
Quantity A = 5 and Quantity B = 2

5- Choice C is correct

The correct answer is The two quantities are equal.
The profit of their business will be divided between Emma and Sophia in the ratio 3 to 4 respectively.
Therefore, Emma receives \frac{3}{7} of the whole profile and Sophia receives \frac{4}{7} of the whole profile.
Quantity A: The money Emma receives when the profit is $560 equals: \frac{3}{7}\ ×\ 560=240
Quantity B: The money Sophia receives when the profit is $420 equals: \frac{4}{7}\ ×\ 420=240
The two quantities are equal.

6- Choice E is correct

The correct answer is 5\sqrt{5}
V_1=\frac{4\ π}{3}\ (\frac{5}{2})^3
V_2=\frac{4\ π}{3}\ (\frac{\sqrt5 }{2})^3 → \frac{ V_1}{V_2} =5\sqrt5

7- Choice D is correct

The correct answer is x=22, \ y=48
\begin{cases}-\ \frac{x}{2}\ +\ \frac{y}{4}=1\\ -\ \frac{5\ y} {6}\ +\ 2\ x=4\end{cases} →multiply the top equation by 4 then:
\begin{cases} -\ 2\ x\ +\ y=4 \\ -\ \frac{5\ y}{6}\ +\ 2\ x\ =4 \end{cases} →add two equations
\frac{1}{6} \ y=8→y=48, plug in the value of y into the first euation. → x=22

8- Choice D is correct

The correct answer is 2^{16}
We know that,\sqrt[n]{a^m }=a^{\frac{m}{n}} then:
\sqrt{y}=\sqrt{2^4} =2^2=4→(2^4)^4=2^{16}

9- Choice B is correct

The correct answer is 61.28
average = \frac{sum \ of\ terms }{number \ of\ terms}
The sum of the weight of all girls is: 18 \ ×\ 60 = 1080 kg
The sum of the weight of all boys is: 32 \ ×\ 62 = 1984 kg
The sum of the weight of all students is: 1080 \ +\ 1984 = 3064 kg
average = \frac{3064 }{50} = 61.28

10- Choice D is correct

The corrcet answer is 300\%
Write the equation and solve for B: 0.60 A = 0.20 B, divide both sides by 0.20, then you will have 
\frac{0.60}{0.20} A = B, therefore: B = 3 A, and B is 3 times of A or it’s 300\% of A.

11- Choice B is correct

The correct answer is 2
(x\ -\ 2)^3=27→x\ -\ 2=3→x=5 →(x\ -\ 4)\ (x\ -\ 3)=(5\ -\ 4)\ (5\ -\ 3)=(1)\ (2)=2

12- Choice A is correct

The correct answer is 9
average=\frac{sum \ of\ terms}{number \ of\ terms} → \frac{x\ +\ y\ +\ 5}{3}=5→x\ +\ y=10
\begin{cases}x\ +\ y=10\\ x\ -\ y=-\ 8\end{cases} add both equations: 2\ x=2→x=1→y=9→x\ ×\ y=9

13- Choice D is correct

The correct answer is 5 cm
Formula for the Surface area of a cylinder is:
SA=2\ π\ r^2+2\ π\ r\ h\ \to 150\ π=2\ π\ r^2\ +\ 2\ π\ r\ (10)\to r^2\ +\ 10\ r\ -\ 75=0
(r\ +\ 15)\ (r\ -\ 5)=0\to r=5 or r= -\ 15 (unacceptable)

14- Choice E is correct

The correct answer is y = x
The slop of line A is: m=\frac{y_2\ -\ y_1}{x_2\ -\ x_1 }=\frac{3\ -\ 2}{4\ -\ 3}=1
Parallel lines have the same slope and only choice E (y=) has slope of 1.

15- Choice B is correct

The correct answer is 31,752
number of Mathematics book: 0.3\ ×\ 840=252
number of English book: 0.15\ ×\ 840=126
product of number of Mathematics and number of English book: 252\ ×\ 126=31,752

16- Choice D is correct

The correct answer is 108^°,54^°
The angle α is: 0.3\ ×\ 360=108^°
The angle β is: 0.15\ ×\ 360=54^°

17- Choice B is correct

The correct answer is 120
According to the chart, 50\% of the books are in the Mathematics and Chemistry sections.
Therefore, there are 420 books in these two sections.
0.50 \ ×\ 840 = 420
γ\ +\ α=420, and γ=\frac{2}{5}\ α
Replace γ by \frac{2}{5} \ α in the first equation.
γ\ +\ α=420→\frac{2}{5} α\ +\ α=420→\frac{7}{5} \ α=420→multiply both sides by \frac{5}{7}
(\frac{5}{7})\ \frac{7}{5} α=420\ ×\ (\frac{5}{7})→α=\frac{420\ ×\ 5}{7}=300
α=300→γ=\frac{2}{5} α→γ=\frac{2}{5}\ ×\ 300=120
There are 120 books in the Chemistry section.

18- Choice A is correct

The correct answer is 8
We have: (x\ +\ 2)\ (x\ +\ p)=x^2\ +\ (2\ +\ p)\ x\ +\ 2\ p→2\ +\ p=6→p=4 and r=2\ p=8

19- Choice B is correct

The correct answer is 10
This question is a combination problem. The formula for combination is:
nCr = \frac{n!}{r!\ (n\ -\ r)!}
This formula is for the number of possible combinations of r objects from a set of n objects.
Using the information in the question:
5C3 = \frac{5!}{3!\ (5\ -\ 3)!}=\frac{5\ × \ 4\ ×\ 3\ ×\ 2\ ×\ 1}{3\ ×\ 2\ ×\ 1\ ×\ (2\ ×\ 1)}=10

20- Choice C is correct

The correct answer is 8
Plug in the value of each option in the inequality.
A.1      (1\ -\ 2)^2\ +\ 1>3\ (1)\ -\ 1→2>2             No!
B. 6     (6\ -\ 2)^2\ +\ 1>3\ (6)\ -\ 1→17>17         No!
C. 8     (8\ -\ 2)^2\ +\ 1>3\ (8)\ -\ 1→37>23         Bingo!
D. 3    (3 \ -\ 2)^2\ +\ 1 >3\ (3)\ -\ 1→2>8              No!
C 4     (4\ -\ 2)^2\ +\ 1>3\ (4)\ -\ 1→5>11            No!

20- Choice C is correct

The correct answer is 8
Plug in the value of each option in the inequality.
A.1      (1\ -\ 2)^2\ +\ 1>3\ (1)\ -\ 1→2>2             No!
B. 6     (6\ -\ 2)^2\ +\ 1>3\ (6)\ -\ 1→17>17         No!
C. 8     (8\ -\ 2)^2\ +\ 1>3\ (8)\ -\ 1→37>23         Bingo!
D. 3    (3 \ -\ 2)^2\ +\ 1 >3\ (3)\ -\ 1→2>8              No!
C 4     (4\ -\ 2)^2\ +\ 1>3\ (4)\ -\ 1→5>11            No!

21- Choice C is correct

The correct answer is The two quantities are equal.
Simplify both quantities.
Quantity A: (-\ 5)^4=(-\ 5)\ ×\ (-\ 5)\ ×\ (-\ 5)\ × \ (- \ 5)=625
Quantity B: 5\ ×\ 5\ ×\ 5\ ×\ 5=625
The two quantities are equal.

22- Choice C is correct

The correct answer is The two quantities are equal.
Quantity A is: \frac{3\ +\ 4\ +\ x}{3}=3→x=2
Quantity B is: \frac{2\ +\ (2\ -\ 6)\ +\ (2\ +\ 4)\ +\ (2\ ×\ 2)}{4}=2

23- Choice D is correct

The correct answer is The relationship cannot be determined from the information given.
Simply change the fractions to decimals.
\frac{4}{5}=0.80
\frac{6}{7}=0.857…
\frac{5}{6}=0.8333…
As you can see, x lies between 0.80 and 0.857… and it can be 0.81 or 0.84.
The first one is less than 0.833… and the second one is greater than 0.833…
The relationship cannot be determined from the information given.

24- Choice B is correct

The correct answer is Quantity B is greater.
\frac{1}{3^n} <\frac{1}{27} → 3^{-\ n}<3^{-\ 3}→-\ <-\ 3,divide both side by-\ 1→n>3

25- Choice A is correct

The correct answer is Quantity A is greater.
Simplify quantity B.
Quantity B: (\frac{x}{6})^6=\frac{x^6}{6^6}
Since, the two quantities have the same numerator (x^6) and the denominator in quantity B is bigger (6^6>6), then the quantity A is greater.

26- Choice A is correct

The correct answer is Quantity A is greater.
Use PEMDAS (order of operation):
Quantity A = 5 \ +\ 8 \ ×\ (–\ 2)\ –\ [4 \ +\ 22 \ ×\ 5] \ ÷\ 6 = 5 \ +\ 8 \ ×\ (–\ 2) \ –\ [4 \ +\ 110] \ ÷\ 6 =
5 \ +\ 8 \ ×\ (–\ 2) \ –\ [114] \ ÷\ 6 = 5 \ +\ (–\ 16) \ –\ 19 = 5 \ +\ (–\ 16) \ – \ 19 = –\ 11 \ –\ 19 = –\ 30
Quantity B = [6 \ ×\ (–\ 24) \ +\ 8] \ –\ (–\ 4)\ +\ [4 \ ×\ 5] \ ÷\ 2 = [–\ 144 \ +\ 8] \ –\ (–\ 4) \ +\ [20] \ ÷\ 2 =
[–\ 144 \ +\ 8] \ –\ (–\ 4) \ +\ 10 = [–\ 136] \ –\ (–\ 4) \ +\ 10 = [–\ 136] \ +\ 4 \ +\ 10 = –\ 122
-\ 30>-\ 122

27- Choice C is correct

The correct answer is I and III only.
I. |a|<1→-\ 1<a<1
Multiply all sides by b. Since, b>0→-\ b<b\ a<b
II. Since, -\ 1<a<1,and a<0→-\ a>a^2>a (plug in \frac{-\ 1}{2}, and check!)
III. -\ 1<a<1,multiply all sides by 2,then: -\ 2<2a<2,subtract 3 from all sides,the:
-\ 2\ -\ 3<2\ a\ -\ 3<2\ -\ 3→-\ 5<2\ a\ -\ 3<-\ 1

28- Choice C is correct

The correct answer is 12
The ratio of boy to girls is 4:7. Therefore, there are 4 boys out of 11 students.
To find the answer, first divide the total number of students by 11, then multiply the result by 4.
44 \ ÷\ 11 = 4 ⇒ 4 \ ×\ 4 = 16
There are 16 boys and 28\ (44 \ –\ 16) girls. So, 12 more boys should be enrolled to make the ratio 1:1

29- Choice A is correct

The correct answer is 45
First, find the number.
Let x be the number. Write the equation and solve for x.
150 \% of a number is 75, then:
1.5\ ×\ x=75 ⇒ x=75\ ÷\ 1.5=50
90 \% of 50 is:
0.9 \ ×\ 50 = 45

30- Choice D is correct

The correct answer is 11
Check each option provided:
A. 1     \frac{4\ +\ 5\ +\ 8\ +\ 11\ +\ 12}{5}=\frac{40}{5}=8
B. 4    \frac{1\ +\ 5\ +\ 8\ +\ 11\ +\ 12}{5}=\frac{37}{5}=7.4
C. 5     \frac{1\ +\ 4\ +\ 8\ +\ 11\ +\ 12}{5}=\frac{36}{5}=7.2
D. 11     \frac{1\ +\ 4\ +\ 5\ +\ 8 \ +\ 12}{5}=\frac{30}{5}=6
E. 12    \frac{1\ +\ 4\ +\ 5\ +\ 8\ +\ 11}{5}=\frac{29}{5}=5.8

31- Choice C is correct

The correct answer is 72
length of the rectangle is: \frac{5}{4}\ ×\ 16=20
perimeter of rectangle is: 2\ ×\ (20\ +\ 16)=72

32- Choice B is correct

The correct answer is 0.88 D
To find the discount, multiply the number by (100\% \ –  rate of discount).
Therefore, for the first discount we get:  (D) (100\% \ –\  20\%) = (D) (0.80) = 0.80 D
For increase of 10\%: (0.85 D) (100\% \ +\  10\%) = (0.85 D) (1.10) = 0.88 D = 88\% of  D

33- Choice D is correct

The correct answer is 24
Let x be the length of AB, then:
15=\frac{x\ ×\ 5}{2}→x=6
The length of AC =\sqrt{6^2\ +\ 8^2 }=\sqrt{100}=10
The perimeter of ∆ABC=6\ +\ 8\ +\ 10=24

34- Choice D is correct

The correct answer is 𝑚=0, y\ −intercept =4
Since line l is parallel to x-axis, therefore the slope of l is equal to 0 and the value of y is the same as the value of y in the point (-\ 3, 4). Therefore, y-intercept is 4.

35- Choice A is correct

The correct answer is January and February
First find the number of pants sold in each month.
A. January: 110, February: 88, March: 90, April: 70, May: 85, June: 65
Check each option provided.
January and February, 
(\frac{110 \ - \ 88}{110}) \ × \ 100=\frac{22}{110} \ × \ 100=20\%
B. February and March, there is an increase from February to March.
C. March and April
(\frac{90 \ - \ 70}{90}) \ × \ 100=\frac{20}{90} \ × \ 100=22.22\%
D. April and May: there is an increase from April to May
May and June
(\frac{85 \ - \ 65}{85}) \ × \ 100=\frac{20}{85} \ × \ 100=23.53\%

36- Choice D is correct

The correct answer is 147.5, 30
Let’s order number of shirts sold per month:
130,140,145,150,160,170
median is: \frac{145 \ + \ 150}{2}=147.5
Let’s list the number of shoes sold per month:
20,25,25,35,35,40
mean is: \frac{20 \ + \ 25 \ + \ 25 \ + \ 35 \ + \ 35 \ + \ 40}{6}=\frac{180}{6}=30

37- Choice E is correct

The correct answer is 50
Let x be the number of shoes need to be added in April. Then:
\frac{70}{20 \ + \ x}=(\frac{5}{17}) \ (\frac{85}{25}) →\frac{70}{20 \ + \ x}=\frac{425}{425}=1→
70=20 \ + \ x→x=50

38- Choice B is correct

The correct answer is -\ 12
|x\ -\ 2\ x\ -\ 5\ +\ 7|=4→ |-\ x\ +\ 2|=4 →-\ x\ +\ 2=4 or-\ x\ +\ 2=-\ 4
→x=-\ 2 or x=6
The product of all possible values of x = (-\ 2)\ ×\ 6=-\ 12

39- Choice D is correct

The correct answer is 40
The area of ∆BED is 16, then: \frac{4\ ×\ AB}{2}=16→4\ ×\ AB=32→AB=8
The area of ∆BDF is 18, then: \frac{3\ ×\ BC}{2}=18→3\ ×\ BC=36→BC=12
The perimeter of the rectangle is = 2\ ×\ (8\ +\ 12)=40

40- Choice E is correct

The correct answer is 4\sqrt{3}
Based on triangle similarity theorem:
\frac{a}{a\ +\ b}=\frac{c}{3}→c=\frac{3\ a}{a\ +\ b}=\frac{3\sqrt3}{3\sqrt3}=1→ 
area of shaded region is:
(\frac{c\ +\ 3}{2})\ (b)=\frac{4}{2}\ ×\ 2\sqrt{3}=4\sqrt{3}

 

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