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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?

  • algebra -

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    29 - 3 - 7 + 1 = 20

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