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What percentage at least must have lost all 4 items?

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At a school outing 81% of the boys had lost a shoe, 82% of the boys had lost a sock, 77% of the boys had lost a handkerchief and 68% o the boys had lost a hat.
What percentage at least must have lost all 4 items?

posted Sep 26, 2018 by Mridul

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