Mel J.

asked • 05/08/21

From the 220 graduating students in a school, 110 attended semi - formal....

From the 220 graduating students in a school, 110 attended semi - formal and 150 attended the prom. If 58 students attended both events, how many students did not attend any event ?


Is this the answer?

We know that,

n(total) = 220

n(semi-formal) = 110

n(formal) = 150

n(both) = 58


110 - 58 = 52 (52 ONLY in semi-formal)

150 - 58 = 92 (92 ONLY in formal)

So then, 220 - 92 - 52 - 58 = 18

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