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08 Nov 2011, 01:46
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B
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Difficulty:
5%
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Question Stats:
90% (00:39) correct
10%
(01:04)
wrong
based on 488
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Does 2m - 3n = 0
(1) m ≠ 0
(2) 6m = 9n
(1) m ≠ 0
(2) 6m = 9n
The answer is B, but I don't understand why.
1. Can't you rewrite the above as 2m = 3n?
If M is...then N is
3 2
6 4
-3 -2
-6 -4
2. The explanation rewrites 2 as 3(2m = 3n) ad says Suff
1. Can't you rewrite the above as 2m = 3n?
If M is...then N is
3 2
6 4
-3 -2
-6 -4
2. The explanation rewrites 2 as 3(2m = 3n) ad says Suff
08 Nov 2011, 02:49
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The question is not asking you to find possible values of (m,n). You are not required to do this at all. All you need to find out is whether 2m -3n = 0
Rewrite the question prompt as -
=> 2m = 3n
=> m/n = 3/2
Statement 1 - m != 0; This tells us nothing about 'n'. Insufficient.
Statement 2 - 6m = 9n => m/n = 3/2 ; The ratio m/n is same as that in the question prompt. Sufficient.
Ans. B
Rewrite the question prompt as -
=> 2m = 3n
=> m/n = 3/2
Statement 1 - m != 0; This tells us nothing about 'n'. Insufficient.
Statement 2 - 6m = 9n => m/n = 3/2 ; The ratio m/n is same as that in the question prompt. Sufficient.
Ans. B
kalrac
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08 Nov 2011, 03:40
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Damouse
The qn says is 2m-3n = 0?
You need to have the values or stat tht gives the result.
i) m is not 0 (may or may not make the stat true)
ii) 6m = 9n implies 2m = 3n so proves the stat 2m-3n = 0 and the stat is true.
