Question
At a school swimming event, 13 of the pupils were boys. Given that that 37 of the girls and 57 of the boys did not know how to swim, how many pupils were there altogether if there were 160 swimmers at the event?
4 m

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At a school swimming event, 13 of the pupils were boys. Given that that 37 of the girls and 57 of the boys did not know how to swim, how many pupils were there altogether if there were 160 swimmers at the event?