Cat- city!

Expert replies

Ozlemg: Master | Next Rank: 500 Posts; Posts: 407; Joined: Tue Jan 25, 2011 9:19 amFollowed by: 7 members; Thanked: 25 times

by Ozlemg » Sat Jul 16, 2011 4:23 am

There are 200 cats in Cat-City. Out of the 200, 70 are street cats and the rest are
domestic cats. 110 cats are gray, 30 out of the gray cats are domestic ones. How many
domestic cats are there which are not gray in Cat-City?
(a) 90.
(b) 80.
(c) 50.
(d) 40.
(e) 25.

Because i could not paraphrase the bold segment of sentence, i could not solve this problem although it is not hard!
What does the bold segment talk about?

thnx

The more you suffer before the test, the less you will do so in the test!

Source: Beat The GMAT — Problem Solving | Sat Jul 16, 2011 4:23 am

GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Sun Jul 17, 2011 10:58 am

Ozlemg wrote:There are 200 cats in Cat-City. Out of the 200, 70 are street cats and the rest are domestic cats. 110 cats are gray, and 30 of the gray cats NOT domestic CATS. How many domestic cats in Cat-City are not gray?

(a) 90.
(b) 80.
(c) 50.
(d) 40.
(e) 25.

The question contains an error: it means to say that 30 of the gray cats are NOT domestic cats; in other words, 30 of the gray cats are street cats.

The following information has been entered into the group grid below:
200 cats
70 street cats, the rest domestic cats
110 gray cats, 30 of which are street cats

Here is the completed grid:

Domestic cats that are not gray = 50.

The correct answer is C.

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