It seems one information is missing to solve number a).
Do a Venn diagram.
You will find
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You know that so you can deduce
You know that so
Finally
A salesman visits 274 housewifes in a town to find out their views about three products A,B and C. He finds that
157 use A,
9 use all three,
14 use A and C but not B,
39 use B and C,
48 use only B
(i) Which product is most popular according to this enquiry.
(ii) How many use product C only.
Please solve the problem and explain the steps.
thanks