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m03#7

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Intern
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m03#7 [#permalink] New post 13 Jul 2011, 08:26
00:00
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Difficulty:

  5% (low)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Foodmart customers regularly buy at least one of the following products: milk, chicken, or apples. 60% of shoppers buy milk, 50% buy chicken, and 35% buy apples. If 10% of the customers buy all 3 products, what percentage of Foodmart customers purchase exactly 2 of the products listed above?

5%
10%
15%
25%
30%

I don't agree with the OA. Shouldn't the formula be M+C+A - (M&C + M&A + C&A) + M&C&A = 100%?
Senior Manager
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Re: m03#7 [#permalink] New post 13 Jul 2011, 09:15
DYNAMITE wrote:
I don't agree with the OA. Shouldn't the formula be M+C+A - (M&C + M&A + C&A) + M&C&A = 100%?


it should be M+C+A - 3(M&C&A) - (M&C + M&A + C&A) + M&C&A = 100%

so 25%

D.

if you draw a venn diagram & try, it will be easier to understand.
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Re: m03#7 [#permalink] New post 13 Jul 2011, 10:16
I've drawn a VENN diagram. Subtracting the M&C away (the 2-part) take away the M&C&A portion (the 3-part) which was added 3 parts. Then we add it back once.
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Re: m03#7 [#permalink] New post 17 Sep 2011, 16:47
In the formula for "explained answers," I cannot figure why "T" is multiplied by (3-1). Can someone shed light on this?
Re: m03#7   [#permalink] 17 Sep 2011, 16:47
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