Question
At a school swimming event, 15 of the pupils were girls. Given that that 310 of the boys and 45 of the girls did not know how to swim, how many pupils were there altogether if there were 165 swimmers at the event?
4 m

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At a school swimming event, 15 of the pupils were girls. Given that that 310 of the boys and 45 of the girls did not know how to swim, how many pupils were there altogether if there were 165 swimmers at the event?