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If m and n are positive integers, is m/n = 3/7 ?

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If m and n are positive integers, is m/n = 3/7 ?  [#permalink]

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New post 19 Aug 2018, 23:19
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

63% (01:49) correct 37% (01:24) wrong based on 83 sessions

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GMAT CLUBT TESTS' FRESH QUESTION:



If m and n are positive integers, is \(\frac{m}{n} = \frac{3}{7}\) ?


(1) \(n = 7\)

(2) \(\frac{2}{5} < \frac{m}{n} < \frac{6}{11}\)

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Re: If m and n are positive integers, is m/n = 3/7 ?  [#permalink]

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New post 20 Aug 2018, 00:31
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1
Clearly statement 1 is insufficient.
from 2, 0.4< m/n <0.54.
Possible values are 5/11 and 4/9 and even 3/7.
Hence insufficient.
Combining both gives N=7.
from this the only possible value is 3/7.
C is the answer.
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Re: If m and n are positive integers, is m/n = 3/7 ?  [#permalink]

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New post 20 Aug 2018, 06:21
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I think answer is E, we may or may not get 3/7 from combining d statements, hence E,

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Re: If m and n are positive integers, is m/n = 3/7 ?  [#permalink]

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New post 20 Aug 2018, 09:29
2
Bunuel wrote:

GMAT CLUBT TESTS' FRESH QUESTION:



If m and n are positive integers, is \(\frac{m}{n} = \frac{3}{7}\) ?


(1) \(n = 7\)

(2) \(\frac{2}{5} < \frac{m}{n} < \frac{6}{11}\)

Here is my approach.
3/7=0.42 (approx.) --> Is \(m=0.42*n\) ?

(1) \(n = 7\) --> no info about m --> Not sufficient

(2) \(\frac{2}{5} < \frac{m}{n} < \frac{6}{11}\) --> 0.4 < \(\frac{m}{n}\) < 0.5 (approx.) --> \(0.4*n < m < 0.5*n\)--> Not sufficient

(1)+(2) Plugging \(n=7\) into inequation: \(0.4*7<m<0.5*7\) --> \(2.8<m<3.5\) --> \(m=3\) --> \(\frac{m}{n} = \frac{3}{7}\) --> Sufficient

Answer C.
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Re: If m and n are positive integers, is m/n = 3/7 ? &nbs [#permalink] 20 Aug 2018, 09:29
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