How many girls are members of both the Math Club and the Chess Club?

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How many girls are members of both the Math Club and the Chess Club?

(1) At a joint meeting of the Math and Chess Clubs, no members were absent and 18 girls were present.

(2) The Math Club has 27 members, one-third of which are girls, and the Chess club has 24 members, half of which are girls.

Answer: C

Source: Veritas Prep