February 28, 2017

Homework Help: algebra

Posted by Sue Jackson on Monday, August 20, 2012 at 10:40pm.

In a recent survey of 100 women, the following information was gathered.
29 use shampoo A.
28 use shampoo B.
34 use shampoo C.
3 use shampoos A and B.
7 use shampoos A and C.
6 use shampoos B and C.
1 use all three.
How many use shampoo A only?

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