Mathematics, 20.08.2019 20:00, bobthebattlebot

Explain the answer and how to get the answer?
50 people each did one activity at a sports centre.
some of the people went swimming.
some of the people played squash.
the rest of the people used the gym.
21 of the people were female.
6 of the 8 people who played squash were male.
18 of the people used the gym.
9 males went swimming.
work out the number of females who used the gym.

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50 people each did one activity at a sports cen...