1- Choice B is correct
The correct answer is 36\% 50 \ – \ 32 =18 male students \frac{18}{50}= 0.36 Change 0.36 to percent ⇒0.36 \ × \ 100 = 36\%
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2- Choice A is correct
The correct answer is 8640 3 weeks = 18 days Then: 18 \ × \ 8 = 144 hours 144 \ × \ 60 = 8,640 minutes
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3- Choice D is correct
The correct answer is 54 Cathrine’s three best times are 52 \ ,\ 53, and 57. The average of these numbers is: average=\frac{sum}{total} Sum = 52 \ + \ 53 \ + \ 75 = 162 Total number of numbers = 3 average=\frac {162}{3}=54
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4- Choice A is correct
The correct answer is 1200 minutes distance=speed ×time ⇒time=\frac{distance}{speed}=\frac{400 \ + \ 400}{40}=20 (Round trip means that the distance is 800 miles) The round trip takes 20 hours. Change hours to minutes, then: 20 \ × \ 60=1200
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5- Choice C is correct
The correct answer is 144 square feet The area of a 12 feet x 12 feet room is 144square feet. 12 \ × \ 12 = 144
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6- Choice A is correct
The correct answer is 18.83 average=\frac{sum}{total} Sum = 5 \ + \ 8 \ + \ 18 \ + \ 20 \ + \ 30 \ + \ 32 = 113 Total number of numbers = 6 \frac{113}{6} =18.83
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7- Choice D is correct
The correct answer is 14 The factors of 40 are: {1 \ , \ 2 \ , \ 4 \ , \ 10 \ , \ 20 \ , 40} 14 is not a factor of 40.
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8- Choice B is correct
The correct answer is 9 Emma = Lucy Emma = 3 Mike ⇒Lucy = 3 Mike Lucy = Mike + \ 18 then: Lucy = Mike + \ 18 ⇒3 Mike = Mike + \ 18 Remove 1 Mike from both sides of the equation. Then: 2 Mike = 18⇒ Mike = 9
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9- Choice D is correct
The correct answer is 100 1.295432 \ × \ 100 = 129.5432
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10- Choice A is correct
The correct answer is $\ 37.1 an hour 6 percent of 35 is: 35 \ × \frac{6}{100} =2.1 Emily’s new rate is 37.1. 35 \ + \ 2.1= 37.1
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11- Choice D is correct
The correct answer is 42 Let’s review the choices provided and find their sum. 22 \ × \ 4 = 88 25 \ × \ 4 = 100 32 \ × \ 4 = 128 42 \ × \ 4 = 168⇒is greater than 150 and less than 170 Only choice d gives a number that is greater than 150 and less than 170.
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12- Choice A is correct
The correct answer is 4,200 minutes 14 days 14 \ × \ 5 = 70 hours 70 \ × \ 60 = 4,200 minutes
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13- Choice B is correct
The correct answer is 120 hours \frac{1 \ hour}{20 \ coffees}= \frac{x}{2400} ⇒20 \ × \ x = 1 \ × \ 2,400⇒20 \ x=2,400 x=120 It takes 120 hours until she’s made 2,400 coffees.
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14- Choice A is correct
The correct answer is 22.5 Sum = 18 \ + \ 24 \ + \ 12 \ + \ 36 = 90 average=\frac{90}{4} =22.5
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15- Choice C is correct
The correct answer is 55 miles Speed = \frac{distance}{ time} 15.2 =\frac{distance}{ 3.6} ⇒ distance =15.2 \ × \ 3.6=54.72 Rounded to a whole number, the answer is 55.
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16- Choice B is correct
The correct answer is 240 yards Perimeter of a rectangle = 2 \ × length + \ 2 \ × width = 2 \ × \ 80 \ + \ 2 \ × \ 40 = 160 \ + \ 80 = 240
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17- Choice A is correct
The correct answer is 8 quarters Two candy bars costs 90\ ¢ and a package of peanuts cost 65\ ¢ and a can of cola costs 45\ ¢. The total cost is: 90 \ + \ 65 \ + \ 45= 200 200 is equal to 8 quarters. 8 \ × \ 25 = 200
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18- Choice C is correct
The correct answer is 48 \sqrt{64} \ × \sqrt{36} = 8 \ × \ 6 = 48
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19- Choice D is correct
The correct answer 31 132 \ – \ 8=124 \frac{124}{4}=31
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20- Choice A is correct
The correct answer is 13 miles Write a proportion and solve. \frac{\frac{1}{2}inches}{6.5}=\frac{1 \ mile}{x} Use cross multiplication, then: \frac{1}{2} \ x=6.5 → x=13
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21- Choice C is correct
The correct answer is 4.54\% percent of change=\frac{change}{original \ number} 5.75 \ – \ 5.50 = 0.25 percent of change=\frac{0.25}{5.50} = 0.0454 ⇒0.0454 \ × \ 100 = 4.54\%
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22- Choice A is correct
The correct answer is 10 Every day the hour hand of a watch makes 2 complete rotation. (\frac{360}{30}=12 ⇒ a complete rotation takes 12 hour, \frac{24}{12}=2) Thus, it makes 10 complete rotations in 5 days. 2 \ × \ 5 = 10
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23- Choice D is correct
The correct answer is 0.45\% To convert a decimal to percent, multiply it by 100 and then add the percent sign (%). 0.0045 \ × \ 100 = 0.45\%
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24- Choice A is correct
The correct answer is 735,616 The difference of the file added, and the file deleted is: 325,159 \ – \ 312,671 = 12488 723,128 \ + \ 12,488 = 735,616
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25- Choice C is correct
The correct answer is $\ 46.8 25\% \ × \ 60 = \frac{25}{100} \ × \ 60=15 The coupon has $\ 15 value. Then, the selling price of the sweater is $\ 45. 60 \ – \ 15 = 45 Add 4\% tax, then: \frac{4}{100} \ × \ 45 = 1.8 for tax then: 45 \ + \ 1.8 = $\ 46.8
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26- Choice B is correct
The correct answer is 3,360 minutes 2 Weeks = 14 Days 4 hours × 14 Days = 56 hours 56 hours =3,360 minutes
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27- Choice A is correct
The correct answer is 2 weeks 1 quart = 0.25 gallon 24 quarts = 24 \ × \ 0.25 =6 gallons then: \frac{6}{3} = 2 weeks
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28- Choice C is correct
The correct answer is - \ 2 6 \ y \ + \ 5 \ y \ + \ 4 \ y = − \ 30 ⇒ 15 \ y = − \ 30 ⇒ \ y = − \ 2
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29- Choice A is correct
The correct answer is 3 3\frac{3}{2} \ − \ 1\frac{2}{4}= 3\frac{6}{4} \ − \ 1 \frac{2}{4} = \frac{18}{4} \ − \frac{6}{4}= \frac{12}{4} = 3
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30- Choice A is correct
The correct answer is 7 210 \ ÷ \ 30 = 7
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31- Choice D is correct
The correct answer is 35 From the choices provided, 10 \ , \ 20 and 35 are divisible by 5. From these numbers, 35 is the biggest.
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32- Choice A is correct
The correct answer is x^2 \ + \ 7 \ x \ + \ 12 Use FOIL (First, Out, In, Last) method. (x \ + \ 4) \ (x \ + \ 3) = x^2 \ + \ 3 \ x \ + \ 4 \ x \ + \ 12 = x^2 \ + \ 7 \ x \ + \ 12
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33- Choice A is correct
The correct answer is 4 Oven 1 = 3 oven 2 If Oven 2 burns 4 then oven 1 burns 12 pizzas. 4 \ + \ 12 = 16
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34- Choice C is correct
The correct answer is 4.2 \ × \ 10^5 In scientific notation form, numbers are written with one whole number times 10 to the power of a whole number. Number 420,000 has 6 digits. Write the number and after the first digit put the decimal point. Then, multiply the number by 10 to the power of 5 (number of remaining digits). Then: 420,000 =4.2 \ × \ 10^5
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35- Choice A is correct
The correct answer is 125^\circ An obtuse angle is an angle greater than 90^\circ and less than 180^\circ.
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36- Choice C is correct
The correct answer is 45 Perimeter of a triangle = side 1 + side 2 + side 3 = 15 \ + \ 15 \ + \ 15 = 45
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37- Choice A is correct
The correct answer is 5^9 Use exponent multiplication rule: x^a \ . \ x^b = x^{a \ + \ b} Then: 5^3 \ × \ 5^6 = 5^9
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38- Choice C is correct
The correct answer is 113.04 Diameter = 12 then: Radius =6 Area of a circle = π \ r^2 ⇒ A = 3.14 \ (6)^2 =113.04
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39- Choice C is correct
The correct answer is 6589.5 6589.49235 rounded to the nearest tenth equals 6589.5 (Because 6589.49 is closer to 6,589.5 than 6,589.4)
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40- Choice A is correct
The correct answer is 5 \ × \ 4 \ × 3 \ × 2 \ × \ 1 5! = 5 \ × \ 4 \ × \ 3 \ × \ 2 \ × \ 1
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41- Choice C is correct
The correct answer is 8 \sqrt[3]{512} = 8
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42- Choice A is correct
The correct answer is (1 \ , \ 2) Let’s review the choices provided. Put the values of x and y in the equation. (1\ , \ 2) ⇒x = 1 ⇒y = 4 This is not true! (2 \ , \ 10) ⇒x = 2 ⇒y = 10 This is true! (- \ 1 \ , \ - \ 8) ⇒ x = - \ 1 ⇒y = - \ 8 This is true (3 \ , \ 16) ⇒x = 3 ⇒y = 16 This is true!
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43- Choice A is correct
The correct answer is 25,200 square feet Area of a rectangle = width × length = 120 \ × \ 210 = 25,200
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44- Choice A is correct
The correct answer is 5 Use distance formula: d=\sqrt{(x_1 \ - \ x_2)^2 \ + \ (y_1 \ - \ y_2)^2} =\sqrt{(1 \ - \ (- \ 2))^2 \ + \ (3 \ - \ 7)^2} \sqrt{9 \ + \ 16} =\sqrt{25} = 5
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45- Choice D is correct
The correct answer is 10000 Number 3.356452 should be multiplied by 10,000 in order to obtain the number 33,564.52 3.356452 \ × \ 10,000 = 33,564.52
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46- Choice B is correct
The correct answer is 49 From the list of numbers 7 \ , \ 11 , and 31 are prime numbers. Their sum is: 7 \ + \ 11 \ + \ 31= 49
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47- Choice A is correct
The correct answer is 52 Let’s review the choices provided. 40 \ × \ 5 = 200 52 \ × \ 5 = 260 70 \ × \ 5 = 350 68 \ × \ 5 = 340 From choices provided, only 260 is greater than 240 and less than 320.
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48- Choice A is correct
The correct answer is \frac{1}{2} 50\% =\frac{50}{100} =\frac{1}{2}
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49- Choice C is correct
The correct answer is 36 The cube of 6 = 6 \ × \ 6 \ × \ 6 = 216 \frac{1}{6} \ × \ 216 =36
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50- Choice A is correct
The correct answer is 36 \ x^8 4 \ (3 \ x^4)^2⇒ 4 \ × \ 3^2 \ × \ x^8 = 36 \ x^8
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51- Choice D is correct
The coorect answer is 120^\circ Two Angles are supplementary when they add up to 180 degrees. 120^\circ \ + \ 60^\circ = 180^\circ
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52- Choice D is correct
The correct answer is 64 factor of 24 = {1 \ , \ 2 \ , \ 3 \ , \ 4 \ , \ 6 \ , \ 8 \ , \ 12 \ , \ 24} 64 is not a factor of 24.
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53- Choice D is correct
The correct answer is 11 2 \ – \ (– \ 9) = 2 \ + \ 9 = 11
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54- Choice A is correct
The correct answer is 18 \frac{30}{100} \ × \ 60 =18
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55- Choice B is correct
The correct answer is 8 x^2 \ – \ 64 = 0 ⇒ x^2 = 64 ⇒x could be 8 or – \ 8.
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