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A store sells chairs individually or in sets of 6. The store

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A store sells chairs individually or in sets of 6. The store [#permalink] New post 22 Jul 2009, 11:55
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A
B
C
D
E

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100% (02:07) correct 0% (00:00) wrong based on 1 sessions
A store sells chairs individually or in sets of 6. The store charges less for purchasing a set of 6 chairs than for purchasing 6 chairs individually. How much does the store charge for purchasing a set of 6 chairs?
a. Buying a set of 6 is 10% less than buying 6 individually
b. Buying a set of 6 is $20 more than buying 5 individually
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Re: GMATPrep DS [#permalink] New post 22 Jul 2009, 12:19
Let the price of set of 6 be $y and each of the chair be $x


Stmt 1 ) Set of 6 is 10% less than 6 individual
therefore x = (0.9) * 6y

x = 5.4y .... 1

Insuff

Stmt2) x = $20 + 5y .... 2

Insuff

Combing them
use the value of x got from 1 in 2

5.4y = $20 + 5 y

Solve for y and then x

therefore suff

Is the answer C ?
Re: GMATPrep DS   [#permalink] 22 Jul 2009, 12:19
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A store sells chairs individually or in sets of 6. The store

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