February 21, 2017

Homework Help: ALGEBRA

Posted by Monic on Thursday, May 10, 2012 at 12:24am.

In a recent survey of 100 women, the following information was gathered.
36 use shampoo A.
37 use shampoo B.
38 use shampoo C.
14 use shampoos A and B.
8 use shampoos A and C.
9 use shampoos B and C.
3 use all three.
Use the figure to answer the question in the problem.

How many are using shampoo A only (Region I)?

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