Question
At a school swimming event, 25 of the pupils were girls. Given that that 35 of the boys and 310 of the girls did not know how to swim, how many pupils were there altogether if there were 143 swimmers at the event?
4 m

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At a school swimming event, 25 of the pupils were girls. Given that that 35 of the boys and 310 of the girls did not know how to swim, how many pupils were there altogether if there were 143 swimmers at the event?