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
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2- Choice B is correct
The correct answer is 0 (5.2 + 5.3 + 5.5) x=16x 16 x=x Then x=0
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3- Choice A is correct
The correct answer is 52 1x=1152=52
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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)
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5- Choice A is correct
The correct answer is 2 2042 Converting mixed numbers to fractions, our initial equation becomes 83 × 134 Applying the fractions formula for multiplication 8 × 133 × 14=10442=2 2042
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6- Choice C is correct
The correct answer is 0.45 920=0.45
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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.
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8- Choice A is correct
The correct answer is 150 25 ÷ 16=150
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9- Choice A is correct
The correct answer is 32 1510=32
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10- Choice A is correct
The correct answer is 125 545=53=125
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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
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12- Choice A is correct
The correct answer is 45 Let x be the average of numbers. Then: 1505 < x < 2505 30 < x < 50 From choices provided, only 45 is correct.
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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
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14- Choice A is correct
The correct answer is 12 3 12 − 2 56=3 + 13 − 2 − 56=12
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15- Choice C is correct
The correct answer is 10 Volume = length × width × height 3000=15 × 20 × height → height =10
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16- Choice C is correct
The correct answer is 9 feet yards =12 feet (15feet+7yrds)4=(15feet+21feet)4=(36feet)4=9 feet
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17- Choice A is correct
The correct answer is 8 + c If a=4 then: b=422 + c⇒ b=422 + c=8 + c
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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
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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.
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20- Choice C is correct
The correct answer is 151 Circumference =2 π r→ Circumference =2 (3.14) (24)=150.72≅151
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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.
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22- Choice A is correct
The correct answer is 3 hours Jason spent 10% of his total time (30 hours) on Physics. Then: 10100 × 30=3
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23- Choice C is correct
The correct answer is approximately 70 hours Speed =distancetime 60=4,200time→ tme =4,20060=70
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24- Choice D is correct
The correct answer is 32 Plug in 120 for F in the equation: C =26 (F – 24)=26 (120 – 24)=26 (96)=32
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25- Choice A is correct
The correct answer is 10 hours Jason spent 50% of his time on Biology and History. Then: 50100 × 20=10
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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.
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27- Choice C is correct
The correct answer is 1.66 12 + 36 + 23=3 + 3 + 46=106=1.66
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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
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29- Choice C is correct
The correct answer is $3.8 25% of x=15.20 x=25 × 15.20100=3.8
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30- Choice D is correct
The correct answer is 25 18=0.125→C=5,120=0.05→D=5→ C × D=5 × 5=25
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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
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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
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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
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34- Choice A is correct
The correct answer is 15 32 x + 15=12 →32 x=12 − 15 → 32 x=5 − 210 →32 x=310 x=630=15
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35- Choice D is correct
The correct answer is 14 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 14.
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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.
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