Question
At a school swimming event, 12 of the students were girls. Given that that 310 of the boys and 35 of the girls did not know how to swim, how many students were there altogether if there were 143 swimmers at the event?
4 m

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At a school swimming event, 12 of the students were girls. Given that that 310 of the boys and 35 of the girls did not know how to swim, how many students were there altogether if there were 143 swimmers at the event?