A box of doughnuts contains glazed, cream-filled, and jelly : GMAT Data Sufficiency (DS) - Page 2
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A box of doughnuts contains glazed, cream-filled, and jelly

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Re: A box of doughnuts contains glazed, cream-filled, and jelly [#permalink]

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New post 31 Mar 2016, 17:28
Nsentra wrote:
A box of doughnuts contains glazed, cream-filled, and jelly doughnuts. The box contains no other types of doughnuts. One doughnut is randomly selected from the box. What is the probability that the doughnut selected is glazed?

(1) If a glazed doughnut is selected, then the probability of withdrawing a second glazed doughnut is 2/5

(2) There were originally 5 glazed doughnuts in the box.



pretty straight forward question..looks like a 600-700 than a 700 lvl...

we need to find: G/(G+C+J)

1. G-1/(G+C+J-1) = 2/5
it could have been 3 G, and probability is 1/2
or it could be 5 G, and 11 total, thus probability is 5/11.
1 alone is insufficient.

2 alone is insufficient.

1+2
we know that originally, there were 5 G.
so 2x/5x => 2x=5-1 = 4, so x=2. or total there were 11 donuts, out of which 5 were G.

sufficient.
C
Re: A box of doughnuts contains glazed, cream-filled, and jelly   [#permalink] 31 Mar 2016, 17:28
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A box of doughnuts contains glazed, cream-filled, and jelly

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