McGraw-Hill Education GRE 2019

Step 1: Set up the given ratios:

d

c =

3

2

c

b =

5

7

Step 2: Manipulate the ratios so that the quantity for the overlapping element

is the same in both ratios.

In the first ratio, there are 2 parts cats, and in the second ratio, there are

5 parts cats. To make the ratios comparable, manipulate the two fractions

so that cats will be 5 × 2 = 10 in both fractions.

d

c =

3 × 5

2 × 5 =

15

10

c

b =

5 × 2

7 × 2 =

10

14

Now that both ratios are in terms of the same number of cats, the ratio of

dogs to cats to birds is 15:10:14. The ratio of dogs to birds is thus 15:14.

246 PART 4 ■ MATH REVIEW

03-GRE-Test-2018_173-312.indd 246 12/05/17 11:52 am