Question
At a school swimming event, 13 of the pupils were girls. Given that that 27 of the boys and 37 of the girls did not know how to swim, how many pupils were there altogether if there were 154 swimmers at the event?
4 m

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At a school swimming event, 13 of the pupils were girls. Given that that 27 of the boys and 37 of the girls did not know how to swim, how many pupils were there altogether if there were 154 swimmers at the event?