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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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The number of hardcover books at bookstore X is 67.5% of all [#permalink]

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New post 24 Dec 2010, 05:05
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A
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C
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E

Difficulty:

  35% (medium)

Question Stats:

75% (01:03) correct 25% (00:53) wrong based on 59 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.
[Reveal] Spoiler: OA

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Re: percent DS [#permalink]

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New post 24 Dec 2010, 08:14
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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
[Reveal] Spoiler:
C

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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, 06:18
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Re: The number of hardcover books at bookstore X is 67.5% of all   [#permalink] 15 Oct 2017, 06:18
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