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Last Updated on May 6, 2023
GMAT OFFICIAL GUIDE DS
Solution:
We need to determine the ratio of the number of boys to the number of girls. If we denote the number of boys as b and the number of girls as d, we can say:
b/g = ?
Statement One Alone:
There are 3 times as many girls as boys in Mr. Smith’s class.
Using statement two we can say:
g = 3b
g/b = 3
b/g = 1/3
Statement one is sufficient to answer the question. We can eliminate answer choices B, C, and E.
Statement Two Alone:
The number of boys is 1/4 of the total number of boys and girls in Mr. Smith’s class.
Using statement two we can say:
b = ¼(b + g)
4b = b + g
3b = g
b/g = 1/3
Statement two is sufficient to answer the question.
Answer: D
