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Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80

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GMATD11
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Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80 [#permalink] New post   Updated on: 08 Nov 2018, 04:18
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Does nm =40?

(1) 10/n = m/4
(2) 5n = 20 and 8m = 80

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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.
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D

Originally posted by GMATD11 on 01 May 2012, 01:29.
Last edited by Bunuel on 08 Nov 2018, 04:18, edited 4 times in total.
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Re: Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80 [#permalink] New post   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.
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Re: Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80 [#permalink] New post   31 Oct 2018, 10:58
gmatbusters wrote:
Does nm =40?
(1) \(\frac{10}{n} = \frac{m}{4}\)
(2) 5n = 20 and 8m = 80


1. Cross multiplying, we get mn = 40
2. Shows that n =4 and m = 10. mn = 40

D
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Re: Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80 [#permalink] New post   10 Jan 2019, 19:53
Bunuel wrote:
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.


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Re: Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80 [#permalink] New post   12 Mar 2022, 07:27
Bunuel wrote:
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.


Dont we need to know that n is not Zero for the cross multiplication?
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Re: Does nm =40? (1) 10/n = m/4 (2) 5n = 20 and 8m = 80 [#permalink]
12 Mar 2022, 07:27
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