Posted by **Mike** on Wednesday, December 5, 2012 at 11:01pm.

In a recent survey of 100 women, the following information was gathered.

52 use shampoo A.

31 use shampoo B.

39 use shampoo C.

11 use shampoos A and B.

13 use shampoos A and C.

15 use shampoos B and C.

10 use all three.

How many are using shampoo A only? ___

Using the Venn diagram, I got 35 but it was wrong.

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