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Princeton review CAT1 DS

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Princeton review CAT1 DS

by kaf » Thu Mar 19, 2009 2:25 am
Can someone please explain to me why the answer to this DS problem is D although i think is E

If tower A is less than 100 feet tall, is tower B taller than tower A?

(1)Tower B is 3 times as tall as tower A.
(2)Tower A is 30 feet shorter than tower B.


Because

Steam of the question implies that the height of tower A is anything between 1 and 99 therefore

ST1 Tower B can be 3(10) = 30 as well as 3(50) = 150 hence INSUFFICIENT


ST2 Tower A = Tower B - 30 we still do not know the height of Tower A
INSUFFIENT

both statements taken together will still be insuffient because ST1 has more than one value.

Thus i think the correct answer should be E

I would like to know if anyone has anything contrary or point out my mistake to me please
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by scoobydooby » Thu Mar 19, 2009 2:31 am
note we dont want the actual values of the heights of the towers, all we want is "is tower B taller than tower A"

1) B=3A
=>B/A=3
=>B/A>1
=>B>A sufficient


2) A=B-30
=>B-A=30
=>B-A>0
=B>A sufficient

hence D
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by PinkBox » Thu Mar 19, 2009 2:55 pm
read what is being asked carefully. "is tower B taller than tower A?"
notice it doesn't say "how much taller" or "how tall". this is a 'yes' or 'no' question. ur not looking for numbers
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