Data Sufficiency (DS) | Re: How many girls are members of both the Math Club and the Chess Club?

(1) Only
The number of girls belonging to both clubs can range from 0 to 18
Not sufficient

(2) Only
We know there are 9 girls in Math club, and there are 12 girls in Chess club.
The number of girls belonging to both clubs can range from 0 to 9
Not sufficient.

(1)(2)Together
If there are n girls in both clubs
9 + 12 -n = 18
Sufficient.

The answer is thus (C).

Statistics : Posted by zhanbo • on 13 Jul 2023, 01:30 • Replies 1 • Views 74

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