1- Choice C is correct
The correct answer is 25.12 Circumference = 2 \ πr C = 2 \ π \ × \ 4 = 9 \ π π = 3.14 → C = 8 \ π = 25.12
|
2- Choice B is correct
The correct answer is 0 (5.2 \ + \ 5.3 \ + \ 5.5) \ x =16 x 16 \ x = x Then x = 0
|
3- Choice A is correct
The correct answer is \frac{5}{2} \frac{1}{x} = \frac{\frac{1}{1}}{\frac{5}{2}} = \frac{5}{2}
|
4- Choice D is correct
The correct answer is 2 \ (x \ – \ 5) Let a and b be the numbers. Then: a \ + \ b = x a=5 → 5 \ + \ b=x → b=x \ - \ 5 2 \ b = 2 \ (x \ – \ 5)
|
5- Choice A is correct
The correct answer is 2 \ \frac{20}{42} Converting mixed numbers to fractions, our initial equation becomes \frac{8}{3} \ × \ \frac{13}{4} Applying the fractions formula for multiplication \frac{8 \ × \ 13}{3 \ × \ 14} = \frac{104}{42} = 2 \ \frac{20}{42}
|
6- Choice C is correct
The correct answer is 0.45 \frac{9}{20} =0.45
|
7- Choice B is correct
The correct answer is 4.5 If 4.5 \ < \ x \ ≤ \ 8.0, then x cannot be equal to 4.5.
|
8- Choice A is correct
The correct answer is 150 25 \ ÷ \ \frac{1}{6}=150
|
9- Choice A is correct
The correct answer is \frac{3}{2} \frac{15}{10} = \frac{3}{2}
|
10- Choice A is correct
The correct answer is 125 \frac{5^{4}}{5} = 5^{3} = 125
|
11- Choice B is correct
The correct answer is 6 meters Perimeter of a rectangle = 2 (width + length) P = 36, width = 2 \ × length Then: 36=2 \ (2 length + length) → \ 36=6 length → length=6
|
12- Choice A is correct
The correct answer is 45 Let x be the average of numbers. Then: \frac{150}{5} \ < \ x \ < \ \frac{250}{5} 30\ < \ x \ < \ 50 From choices provided, only 45 is correct.
|
13- Choice B is correct
The correct answer is 4 hours The distance between Alex and Jack is 6 miles. Alex running at 4.5 miles per hour and Jack is running at the speed of 6 miles per hour. Therefore, every hour the distance is 1.5 miles less. 6 \ ÷ \ 1.5 = 4
|
14- Choice A is correct
The correct answer is \frac{1}{2} 3 \ \frac{1}{2} \ − \ 2 \ \frac{5}{6} = 3 \ + \ \frac{1}{3} \ - \ 2 \ - \ \frac{5}{6} = \frac{1}{2}
|
15- Choice C is correct
The correct answer is 10 Volume = length × width × height 3000 = 15 \ × \ 20 \ × height → height = 10
|
16- Choice C is correct
The correct answer is 9 feet yards = 12 feet \frac{(15 feet +7 yrds)}{4} = \frac{(15 feet +21 feet)}{4} = \frac{(36 feet)}{4} = 9 feet
|
17- Choice A is correct
The correct answer is 8 \ + \ c If a = 4 then: b = \frac{4^{2}}{2} \ + \ c ⇒ b = \frac{4^{2}}{2} \ + \ c = 8 \ + \ c
|
18- Choice C is correct
The correct answer is 156 inches 1 foot = 12 inches 4 feet, 8 inches =56 inches 7 feet, 16 inches = 100 inches 56 \ + \ 100 =156
|
19- Choice B is correct
The correct answer is (-3, -12) Let’s review the choices provided. Put the values of x and y in the equation. A. (2, 4) ⇒ x = 2 ⇒ y = 4 This is true! B. (−3, −12) ⇒ x = -3 ⇒ y = -11 This is not true! C. (3, 7) ⇒ x = 3 ⇒ y = 7 This is true! D. (1, 1) ⇒ x = 1 ⇒ y = 1 This is true! Only choice B does not work in the equation.
|
20- Choice C is correct
The correct answer is 151 Circumference = 2 \ π \ r → Circumference = 2 \ (3.14) \ (24) = 150.72 \cong 151
|
21- Choice C is correct
The correct answer is 58 degrees All angles in a triangle sum up to 180 degrees. 57 \ + \ 65 = 122 180 \ – \ 122 = 58, The third angle is 58 degrees.
|
22- Choice A is correct
The correct answer is 3 hours Jason spent 10\% of his total time (30 hours) on Physics. Then: \frac{10}{100} \ × \ 30 = 3
|
23- Choice C is correct
The correct answer is approximately 70 hours Speed = \frac{distance}{time} 60 = \frac{4,200}{time}→ tme =\frac{4,200}{60} = 70
|
24- Choice D is correct
The correct answer is 32 Plug in 120 for F in the equation: C = \frac{2}{6} (F – \ 24) = \frac{2}{6} \ (120 \ – \ 24) = \frac{2}{6} \ (96) = 32
|
25- Choice A is correct
The correct answer is 10 hours Jason spent 50\% of his time on Biology and History. Then: \frac{50}{100} \ × \ 20 = 10
|
26- Choice C is correct
The correct answer is 342 Since Lucy gives 6 pieces of candy to each of her friends, then, then number of pieces of candies must be divisible by 6. A. 125 \ ÷ \ 6 = 20.833 B. 235 \ ÷ \ 6 = 39.166 C. 342 \ ÷ \ 6 =57 D. 223 \ ÷ \ 6 = 37.166 Only choice C gives a whole number.
|
27- Choice C is correct
The correct answer is 1.66 \frac{1}{2} \ + \ \frac{3}{6} \ + \ \frac{2}{3}= \frac{3 \ + \ 3 \ + \ 4}{6}=\frac{10}{6}=1.66
|
28- Choice A is correct
The correct answer is 0.89 D To find the discount, multiply the number by (100\% \ – rate of discount). Therefore, for the first discount we get: (D) (100\% \ – \ 15\%) = (D) (0.85) = 0.85 D For increase of 5\% : (0.85 D) (100\% \ + \ 5\%) = (0.85 D) (1.05) = 0.89 D = 89\% of D or 0.89 D
|
29- Choice C is correct
The correct answer is $3.8 25\% of x = 15.20 x=\frac{25 \ × \ 15.20}{100}=3.8
|
30- Choice D is correct
The correct answer is 25 \frac{1}{8}=0.125→C=5, \frac{1}{20}=0.05→D=5→ C \ × \ D=5 \ × \ 5=25
|
31- Choice A is correct
The correct answer is ($1,\050\) Use simple interest formula: I= prt (I= interest, p= principal, r= rate, t= time) I=(14000) \ (0.025) \ (3)=1,050
|
32- Choice A is correct
The correct answer is 115 \ x \ + \ 12,000 \ ≤ \ 25,000 Let x be the number of new shoes the team can purchase. Therefore, the team can purchase 115 \ x. The team had $25,000 and spent $12,000. Now the team can spend on new shoes $8,000 at most. Now, write the inequality: 115 \ x \ + \ 12,000 \ ≤ \ 25,000
|
33- Choice D is correct
The correct answer is 5 Let x be the number. Then: 4 \ x \ + \ 5=25 Solve for x: \ 4 \ x \ + \ 5=25 →4 \ x=25 \ - \ 5=20 →x=20 \ ÷ \ 4=5
|
34- Choice A is correct
The correct answer is \frac{1}{5} \frac{3}{2} \ x \ + \ \frac{1}{5}= \frac{1}{2} \ →\frac{3}{2} \ x = \frac{1}{2} \ - \ \frac{1}{5} \ → \frac{3}{2} \ x =\frac{5 \ - \ 2}{10} \ →\frac{3}{2} \ x = \frac{3}{10} x = \frac{6}{30} = \frac{1}{5}
|
35- Choice D is correct
The correct answer is \frac{1}{4} To get a sum of 4 for two dice, we can get 3 different options: (1, 3), (2, 2), (3, 1) To get a sum of 7 for two dice, we can get 6 different options: (1, 6), (2, 5), (3, 4),\ (4 , 3) , \ ( 5 , 2) , \ (6 , 1) Therefore, there are 9 options to get the sum of 4 or 7. Since, we have 6 \ × \ 6 = 36 total options, the probability of getting a sum of 4 and 7 is 9 out of 36 or \frac{1}{4}.
|
36- Choice D is correct
The correct answer is D Solve for x. -2 \ ≤ \ 2 \ x \ - \ 4 \ < \ 8 ⇒ (add 4 all sides) -2 \ + \ 4 \ ≤ \ 2 \ x \ - \ 4 \ + \ 4 \ < \ 8 \ + \ 4 ⇒ \ 2 \ ≤ \ 2 \ x \ < \ 12 \ ⇒ (divide all sides by 2) \ 1 \ ≤ \ x \ < \ 6 \ x is between 1 and 6. Choice D represent this inequality.
|