Question
At a school swimming event, 15 of the pupils were boys. Given that that 12 of the girls and 45 of the boys 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, 15 of the pupils were boys. Given that that 12 of the girls and 45 of the boys did not know how to swim, how many pupils were there altogether if there were 143 swimmers at the event?