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is a >b: st1 a/b=7/10 st2 a=70/100 b

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Intern
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Joined: 16 Jun 2010
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is a >b: st1 a/b=7/10 st2 a=70/100 b [#permalink] New post 25 Aug 2010, 01:11
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

64% (02:02) correct 36% (00:34) wrong based on 14 sessions
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is a >b

st1 a/b=7/10

st2 a=70/100 b
[Reveal] Spoiler: OA
Manager
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Joined: 02 Apr 2010
Posts: 103
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Kudos [?]: 92 [0], given: 18

Re: ds [#permalink] New post 25 Aug 2010, 02:41
This type of problem is probably solved fastest by picking numbers. The key is to think about positive and negative numbers.

Statement 1:

Cross-multiply to obtain 10*a = 7*b

This will hold true e.g. if a = 7 and b = 10 => a < b, but also if a= -7 and b = -10 => a > b. Hence, statement A is not sufficient.

Statement 2:

I assume the statement reads a = (70 / 100)*b, otherwise it would contradict the first statement. Again cross-multiple and simplify the fraction to obtain 10*a = 7*b.

The second statement doesn't provide you with any additional information. Thus, E is the solution to this problem.
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Re: ds [#permalink] New post 25 Aug 2010, 02:42
both statements essentially say the same thing.. ratio: a:b=7:10 => 10a=7b;

now just plug in some values to see if you can get any definitive answers:

assume a=7, b=10 or a=14, b=20 and so on.... (a< b)

but there are negative answers as well.... a=-7, b=-10 => a > b

I would go with E.....
Re: ds   [#permalink] 25 Aug 2010, 02:42
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