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A drawer contains 12 socks, of which 8 are black and 4 are

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by M7MBA » Tue Apr 30, 2019 1:06 am

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A drawer contains 12 socks, of which 8 are black and 4 are white. If 3 of the socks are removed, how many of the socks that remain in the drawer are black?

(1) The socks that remain in the drawer have a ratio of 2 black to 1 white.
(2) One of the first two socks removed is black.

[spoiler]OA=A[/spoiler]

Source: Princeton Review
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Source: — Data Sufficiency |

by Ian Stewart » Tue Apr 30, 2019 3:19 am
We have 9 socks left. If, as Statement 1 tells us, the ratio of black to white socks is 2 to 1, then 2/3 of the remaining socks are black, and thus 6 are black, so Statement 1 is sufficient. Statement 2 is not sufficient because we have no information about the third sock that was removed, so the answer is A.
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