Question
At a school swimming event, 12 of the students were girls. Given that that 37 of the boys and 57 of the girls did not know how to swim, how many students were there altogether if there were 156 swimmers at the event?
4 m

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At a school swimming event, 12 of the students were girls. Given that that 37 of the boys and 57 of the girls did not know how to swim, how many students were there altogether if there were 156 swimmers at the event?