What was the question for this implicit rationale, and corresponding answer?
The club has a female group which has twice as many members as the male group, so there are 2 + 1 = 3 groups in the club. There are 18 members in the club, which means there are 18 / 3 = 6 members per group. Since the number of female members consists of two groups, then there are 6 * 2 = 12 female members in the club.
 The answer: 12
The question: In a glee club, there are two times as many female than male members. How many female members are there if there are 18 members in the club?