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Ratio

Expert replies
by Soumita Ghosh » Mon Jan 28, 2013 12:52 pm
If the ratio of brown Cars to Blue cars in a certain parking lot is 2:3,how many brown cars are in the lot?

1)There are 15 blue cars in the lot.

2)There are 25 cars total in the lot.

OA-D

My problem is with statement 2.

It is given that there are 25 cars total in the lot. How can be this sufficient?? There is not given that there is only Blue and Brown cars in the lot. There may be other colour cars in the lot.
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Source: — Data Sufficiency |

by Tommy Wallach » Mon Jan 28, 2013 4:28 pm
Hey Soumita,

Where are you getting this question from? Indeed, your complaint is legitimate. The question would need to specify that there are only brown and blue cars in the lot for Statement 2 to be sufficient. OR, double-check that you copied the question down word for word. Even a little change in a phrase somewhere could make a difference. But, as written:

1) 15 blue cars means 2/3 = x/15 x = 10 sufficient

2) There could be 2 brown, 3 blue, and 20 red. There could be 4 brown, 6 blue, and 15 red. Etc.

Hope that helps!

-t
Tommy Wallach, Company Expert
ManhattanGMAT

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by Soumita Ghosh » Tue Jan 29, 2013 5:54 pm
MC Graw-Hill.

Yeah I double checked it.
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