Homework Help: set (math)

Posted by HELP HELP HELP MNHS on Wednesday, January 23, 2013 at 7:25am.

A class of 47 students took examination in algebra and geometry. If 29 passed algebra and 26 passed geometry and 4 failed in both subjects, how many passed both subjects?

With solution please, tnx...

set (math) - Steve, Wednesday, January 23, 2013 at 10:37am
47-29=18 failed algebra
47-26=21 failed geometry
4 failed both

18+21-4=35 failed something
so, 47-35=12 passed both

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