McGraw-Hill Education GRE 2018 by Erfun Geula

Author:Erfun Geula
Language: eng
Format: epub
Publisher: McGraw Hill LLC
Published: 2018-01-15T00:00:00+00:00

There are 500 students, so Cross-multiply to arrive at a range for t: 500 > 3t. Solve for t: Since t must be an integer, the greatest value for t will be the greatest integer less than . = 166.6, so the greatest value for t is 166. The correct answer is B.

15. C The best approach here is to plug in values. Choose a value for a and let that value determine b. If a = 6, then 42 = 6b, and b Now find the ratio of The correct answer is C.

Quantitative Comparison Questions

1. B Choose values that satisfy the constraints in the given information: let’s say there are 3 white marbles and 7 black marbles. In this case, the ratio of white marbles to all marbles is so for the given values, Quantity B is greater. Choose a “weird” case: 7 is the smallest possible number of black marbles when there are 3 white marbles. Let’s choose a larger value for the number of black marbles. Let there be 3 white marbles and 100 black marbles. In this case, the ratio of white marbles to all marbles is so Quantity B is still greater.

2. D Since there are more boys than girls, the current ratio of boys to girls must be greater than 1. The impact of adding 10 girls and 20 boys on the ratio will depend on the original ratio. For example, let’s say there were originally 100 boys and 50 girls. In this case, the original ratio is When 20 boys and 10 girls are added, the new ratio is to 1. In this case, the quantities are equal. Now let’s say the original number of boys was 100 and the original number of girls was 90. In this case, the original ratio is The new ratio will be In this case, Quantity B is greater. Since there is more than one relationship between the quantities, the correct answer is Choice D.

3. D Set the ratios up as fractions: Next, cross-multiply: x2 = 36. Since the exponent on x is even, x = 6 or –6. The relationship between the columns cannot be determined.

4. C Let the revenue = 5x and the expenses = 4x. Use the profit formula: profit = revenue – expenses. Thus profit = 5x – 4x = x. The ratio of profit to expenses is thus . The two quantities are equal.

5. C When you are given two ratios with a common element, you should manipulate the ratios so that the common element has the same value in both ratios. In this case, the common element is b. In the first ratio, 5/12, and in the second ratio, . Manipulate the second ratio to make Thus the ratio of a:b:c = 5:12:21. Since c < 25 and is an integer, c must equal 21. If c = 21, then a = 5.

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