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3 DS from PowerPrep-1

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Source: — Data Sufficiency |
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by gabriel » Thu Oct 16, 2008 11:40 am
Please post one question per thread. I am locking this thread temporarily and will open it once you have posted 2 of the questions on a different thread. I am sorry for this but forum rules have to be followed. Just PM me the questions you want me to remove from this thread.

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by gabriel » Fri Oct 17, 2008 5:04 am
Alright thread reopened.

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by mals24 » Fri Oct 17, 2008 6:25 am
IMO D

We can get the following equation from the question: 50x=30y
Where x is the number of shelves holding 50 books
y is the number of shelves holding 30 books.
We need to find the value of y.

St 1: y=6+x
50x=30(6+x)
x=9 and y=15

St 2: x=9
450=30y
y=15

Hence both sts alone are suff and answer is D
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