Consider the following list of numbers.

Mathematics
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Apr 27th, 2015

7/60 have pierced nose (which implies that 53/60 have pierced ears)

58/60 have pierced ears, however, that would mean 58+7 would be > 60 students, so we subtract 58-53 = 5 students have both ear and nose pierced.

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Apr 27th, 2015

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