1- Choice B is correct
The correct answer is 6 tenths Digit 6 is in the tenths place.
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2- Choice A is correct
The correct answer is 0.64 0.04 × 16.00=4100 × 161=64100=0.64
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3- Choice D is correct
The correct answer is 3 Number of packs needed equals to: 124=3. Then Mary must purchase 3 packs.
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4- Choice C is correct
The correct answer is − 4 x − 8=− 12→ x=− 10 + 8→ x=− 2, Then; x × 2=− 2 × 2=− 4
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5- Choice A is correct
The correct answer is 9 miles per hour His average speed was: 4.50.5=9 miles per hour
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6- Choice D is correct
The correct answer is approximately 66 hours The time it takes to drive from city A to city B is: 360054=66.66
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7- Choice D is correct
The correct answer is 28% Number of males in the classroom is: 50 − 36=14 Then, the percentage of males in the classroom is: 1450 × 100=0.28 × 100=28%
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8- Choice E is correct
The correct answer is x − 40. The amount of flour is: x − 40
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9- Choice A is correct
The correct answer is 63 The perimeter of the quadrilateral is: 5 + 22 + 8 + 28=63
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10- Choice A is correct
The correct answer is 100 Let x be the fourth quarter rate, then: 90 + 82 + 80 + x4=88 Multiply both sides of the above equation by 4. Then: 4 × (90 + 82 + 80 + x4)=4 × 88→ 90 + 82 + 80 + x=352→ 252 + x=352→ x=352 − 252=100
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11- Choice B is correct
The correct answer is $ 28.08 For one person the total cost is: $ 9.36 Therefore, for three persons, the total cost is: 3 × $ 9.36=$ 28.08
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12- Choice A is correct
The correct answer is 16 The equation of a line in slope intercept form is: y=m x + b Solve for y. 6 x + y=10⇒ y=− 6 x + 10 y=− 6 x + 10 The slope of this line is − 6. The slope of the line perpendicular to this line is: m1 × m2=− 1⇒ − 6 × m2=− 1⇒ m2=16
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13- Choice E is correct
The correct answer is 20 Let x be the number. Write the equation and solve for x. 23 × 15=12 x→ 2 × 153=1 x2 , use cross multiplication to solve for x. 2 × 30=1 x × 3⇒ 60=3 x⇒x=20
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14- Choice B is correct
The correct answer is 72,000 Three times of 32,000 is 96,000. One fourth of them cancelled their tickets. One fourth of 96,000 equals 24,000 (14 × 96000=24000). 72,000 (96000 – 24000=72000) fans are attending this week
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15- Choice B is correct
The correct answer is 136 miles Use the information provided in the question to draw the shape. Use Pythagorean Theorem: a2 + b2=c2 802 + 1102=c2⇒ 6400 + 12100=c2⇒ 18500=c2⇒ c≅136 miles
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16- Choice C is correct
The correct answer is 0.97 Ratio of women to men in city A: 570600=0.95 Ratio of women to men in city B: 291300=0.97 Ratio of women to men in city C: 665700=0.95 Ratio of women to men in city D: 528550=0.96 0.97 is the maximum ratio of woman to man in the four cities.
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17- Choice C is correct
The correct answer is 1.05 Percentage of men in city A =6001170 × 100=51.28% Percentage of women in city C =6651365 × 100=48.72% Percentage of men in city A to percentage of women in city C =51.2848.72=1.05
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18- Choice A is correct
The correct answer is I > 3000 x + 21000 Let x be the number of years. Therefore, $ 3,000 per year equals 3000 x. Starting from $ 21,000 annual salary means you should add that amount to 3000 x. Income more than that is: I > 3000 x + 21000
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19- Choice A is correct
The correct answer is 45 x x1 + 4=y9 − 5→ x5=y4→ 5 y=4 x→ y=45 x
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20- Choice A is correct
The correct answer is 132 Let the number of women should be added to city D be x, then: 528 + x550=1.2→ 528 + x=550 × 1.2=660→ x=132
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21- Choice C is correct
The correct answer is 8:12 The average speed of Jason is: 240 ÷ 6=40 km The average speed of Emily is: 120 ÷ 2=60 km Write the ratio and simplify. 40:60⇒8:12
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22- Choice D is correct
The correct answer is 30 cm The length of MN is equal to: 4 x + 6 x=10 x Then: 10 x=50→ x=5010=5 The length of ON is equal to: 6 x=5 × 6=30 cm
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23- Choice D is correct
The correct answer is 108.3% Perimeter of rectangle A is equal to: 2 × (9 + 3)=2 × 12=24 Perimeter of rectangle B is equal to: 2 × (9 + 4)=2 × 13=26 Therefore: 2624 × 100=1.083 × 100=108.3%
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24- Choice A is correct
The correct answer is x3 4√x 4√x13=4√x12 × x= 4√x12 × 4√x=x124 × 4√x= x3 4√x
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25- Choice E is correct
The correct answer is 899 Smallest 3–digit number is 100, and biggest 3–digit number is 999. The difference is: 899
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25- Choice E is correct
The correct answer is 899 Smallest 3–digit number is 100, and biggest 3–digit number is 999. The difference is: 899
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26- Choice E is correct
The correct answer is 3.5 + 72 A. 12 × 13=16 is not equal to whole number B. 12 + 13=3 + 26=56 is not equal to whole number C. 129=43=1.3 is not equal to whole number D. 3.5 +23=73=2.33 is not equal to whole number E. 3.5 + 72=3.5 + 3.5=7 is a whole number
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27- Choice B is correct
The correct answer is 15% The question is this: 530.40 is what percent of 624? Use percent formula: Part = percent/100 × whole 530.40=percent100 × 624→ 530.40=percent × 624100→ 53040= percent × 624 Then, Percent =53040624=85 530.40 is 85 of 624. Therefore, the discount is: 100% – 85%=15%
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28- Choice C is correct
The correct answer is 14 79 4 23 × 3 16=143 × 196=14 × 193 × 6=26618=1339=14 79
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29- Choice A is correct
The correct answer is 4.620 0.30 × 15.4=30100 × 15410=30 × 154100 × 10=46201000=4.620
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30- Choice D is correct
The correct answer is 8 Let x be the number, then; 23 x=14→ x=3 × 142=21 Therefore: 25 x=25 × 21=8
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31- Choice A is correct
The correct answer is $ 750 Use simple interest formula: I = prt (I = interest, p = principal, r = rate, t = time) I =(15000) (0.025) (2)=$ 750
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32- Choice D is correct
The correct answer is 4 Number of boxes equal to: 14436=164=4
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33- Choice A is correct
The correct answer is 10 hours Use distance formula: Distance = Rate × time ⇒500=50 × T, divide both sides by 50. 50050= T ⇒ T =10 hours. Change hours to minutes for the decimal part. 10 hours =10 × 60=600 minutes
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34- Choice B is correct
The correct answer is 135 degrees The angle x and 45 are complementary angles. Therefore: x + 45=180,180° − 45°=135°
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35- Choice E is correct
The correct answer is 7.5 feet Use formula of rectangle prism volume. V = (length) (width) (height) ⇒1800=(20) (12) (height) ⇒ height =1800 ÷ 240=7.5 feet
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36- Choice B is correct
The correct answer is 2.28 m The rate of construction company =25 cm1 min=25 cm/min Height of the wall after 30 min =25 cm1 min × 30 min =570 cm Let x be the height of wall, then 25 x=570 cm→ x=2 × 5705→ x=228 cm =2.28 m
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37- Choice C is correct
The correct answer is 4 Let’s review the choices provided: A. 12 − 2=10→102=5≠2 B. 12 − 3=9→93=3≠2 C. 12 − 4=8→84=2=2 D. 12 − 6=6→66=1≠2 E. 12 − 12=0→012=0≠2
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38- Choice D is correct
The correct answer is 150 The ratio of boys to girls is 3:5. Therefore, there are 3 boys out of 8 students. To find the answer, first divide the total number of students by 8, then multiply the result by 3. 400 ÷ 8=50⇒ 50 × 3=150
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39- Choice D is correct
The correct answer is 125 5 cubed is: 5 × 5 × 5=25 × 5=125
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40- Choice A is correct
The correct answer is 30 Km/h Speed of car A is: 4008=50 Km/h Speed of car B is: 4005=80 Km/h →80 − 50=30 Km/h
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41- Choice D is correct
The correct answer is 56 y=3 a b + 2 b2, Plug in the values of a and b in the equation: a=2 and b=4 y=3 (2) (4) + 2 (4)2=24 + 2 (16)=24 + 32=56
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42- Choice A is correct
The correct answer is 13,25,37,56 13≅0.33 25≅0.4 37≅0.42 56=0.83
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43- Choice E is correct
The correct answer is 11 (2 + 5)27 + 4=(7)27 + 4=497 + 4=7 + 4=11
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44- Choice B is correct
The correct answer is 0.02 x + 6000 x is the number of all sales profit and 2% of it is: 2% × x=0.02 x Employee’s revenue: 0.02 x + 6000
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45- Choice E is correct
The correct answer is 12 π Use the formula of the area of circles. Area =π r2⇒ 36 π=π r2⇒ 36=r2⇒r=6 Radius of the circle is 6. Now, use the circumference formula: Circumference =2 π r=2 π (6)=12 π
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46- Choice C is correct
The correct answer is 18 Prime factorizing of 36=2 × 2 × 3 × 3 Prime factorizing of 54=2 × 3 × 3 × 3 GCF =2 × 3 × 3=18
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47- Choice D is correct
The correct answer is 25 23 Of 150=23 × 150=100 14 Of 100=14 × 100=25
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48- Choice E is correct
The correct answer is 144 0.5 x=(0.2) × 20→ x=8→(x + 4)2= (8 + 4)2= (12)2=144
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49- Choice A is correct
The correct answer is 36∘ The sum of all angles in a quadrilateral is 360 degrees. Let x be the smallest angle in the quadrilateral. Then the angles are: x,2 x,3 x,4 x x + 2 x + 3 x + 4 x=360→ 10 x=360→x=36 The angles in the quadrilateral are: 36°,72°,72°, and 180° The smallest angle is 36 degrees.
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50- Choice E is correct
The correct answer is 40 Length of the rectangle is: 23 × 12=8 Perimeter of rectangle is: 2 × (8 + 12)=40
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