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The number of hardcover books at bookstore X is 67.5% of all

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Director
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Joined: 07 Jun 2004
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The number of hardcover books at bookstore X is 67.5% of all  [#permalink]

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New post 24 Dec 2010, 06:05
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  25% (medium)

Question Stats:

75% (01:01) correct 25% (01:07) wrong based on 64 sessions

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The number of hardcover books at bookstore X is 67.5% of all the books at the store, while the number of hardcover books at bookstore Y is 66.9% of all the books in that store. How many hardcover books are at bookstore Y?

(1) There is the same number of books at both stores.
(2) There are 20,000 more hardcover books at bookstore X than there are at bookstore Y.

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Re: percent DS  [#permalink]

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New post 24 Dec 2010, 09:14
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1
X = Number of books in Store X
Y = Number of books in Store Y
Xh = Number of hardcover books in store X = 0.675X
Yh = Number of hardcover books in store Y = 0.669Y = ?

Statement 1:

X = Y
Not Sufficient to get the value of Y.

Statement 2 :

0.675X - 0.669Y = 20000
1 equation in 2 unknown, Infinite Solutions - Not Sufficient

Combining the statements :
0.675Y - 0.669Y = 20000 - > Sufficient (1 equation, 1 unknown)

Hence, answer is
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Re: The number of hardcover books at bookstore X is 67.5% of all  [#permalink]

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New post 15 Oct 2017, 07:18
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: The number of hardcover books at bookstore X is 67.5% of all &nbs [#permalink] 15 Oct 2017, 07:18
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