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D
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Difficulty:
5%
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Question Stats:
90% (00:33) correct
10%
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wrong
based on 445
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Does nm =40?
(1) 10/n = m/4
(2) 5n = 20 and 8m = 80
(1) 10/n = m/4
(2) 5n = 20 and 8m = 80
a) 10/n = m/4
if we consider different signs of n & m
nm=40 or nm=-40
NS
b) 5n=20 => n=4
8m = 80 =>m=10
=> nm=40 ---Sufficient
Guys do we need to consider that a) is providing ratio so we don't need to consider -ve signs.
if we consider different signs of n & m
nm=40 or nm=-40
NS
b) 5n=20 => n=4
8m = 80 =>m=10
=> nm=40 ---Sufficient
Guys do we need to consider that a) is providing ratio so we don't need to consider -ve signs.
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01 May 2012, 01:44
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Does nm =40?
(1) \(\frac{10}{n} = \frac{m}{4}\)--> cross multiply \(40=mn\). Sufficient. So, as you can see we have only one value for \(mn\)
(2) 5n = 20 and 8m = 80 --> \(n=4\) and \(m=10\) --> \(mn=40\). Sufficient.
Answer: D.
(1) \(\frac{10}{n} = \frac{m}{4}\)--> cross multiply \(40=mn\). Sufficient. So, as you can see we have only one value for \(mn\)
(2) 5n = 20 and 8m = 80 --> \(n=4\) and \(m=10\) --> \(mn=40\). Sufficient.
Answer: D.
