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A certain manufacturer of cake, muffin, and bread mixes has

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Director
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A certain manufacturer of cake, muffin, and bread mixes has [#permalink] New post 27 Jun 2008, 19:41
A certain manufacturer of cake, muffin, and bread mixes has 100 buyers of whom 50 purchases cake mix, 40 purchases muffin mix and 20 purchase both cake mix and muffin mix. If a buyer is to be selected at random from the 100 buyers, what is the probability that the buyer selected will be one who purchases neither cake mix nor muffin mix?

1/10
3/10
1/2
7/10
9/10

50+40-20 + neither = 100

neither = 30
30/100 = 3/10 - B please concur. Thanks
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Re: mix [#permalink] New post 27 Jun 2008, 21:18
Yup, got 3/10 as well.
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Re: mix [#permalink] New post 27 Jun 2008, 22:28
Though 3/10 sounds right answer, I think question is missing some details about bread-mix
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Re: mix [#permalink] New post 28 Jun 2008, 02:21
A certain manufacturer of cake, muffin, and bread mixes has 100 buyers of whom 50 purchases cake mix, 40 purchases muffin mix and 20 purchase both cake mix and muffin mix. If a buyer is to be selected at random from the 100 buyers, what is the probability that the buyer selected will be one who purchases neither cake mix nor muffin mix?

1/10
3/10
1/2
7/10
9/10

***********
If purchaser seperated as detaile below, basing 20 buy both cake and muffin mix

30 - cake mix buyers
20 - muffin
20 - both
remaining 30 bread mix
Now, probability is 30/100 = 3/10

B is the right answer.
Re: mix   [#permalink] 28 Jun 2008, 02:21
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A certain manufacturer of cake, muffin, and bread mixes has

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