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If the ratio of boys to girls in a class is 5 to 3, which of the follo

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If the ratio of boys to girls in a class is 5 to 3, which of the follo  [#permalink]

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New post 24 Dec 2018, 21:18
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

97% (00:35) correct 3% (00:33) wrong based on 37 sessions

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Re: If the ratio of boys to girls in a class is 5 to 3, which of the follo  [#permalink]

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New post 24 Dec 2018, 21:21
Ratio is 5x:3x.

Total is 8x. Only 36 is not a multiple of 8.

B is the answer

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Re: If the ratio of boys to girls in a class is 5 to 3, which of the follo  [#permalink]

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New post 25 Dec 2018, 02:58
Bunuel wrote:
If the ratio of boys to girls in a class is 5 to 3, which of the following could not be the number of students in the class?

A. 32
B. 36
C. 40
D. 48
E. 56



we check by using relation
8*x/5= answer options
from given options only 36 wont be correct

IMO B
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Re: If the ratio of boys to girls in a class is 5 to 3, which of the follo  [#permalink]

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New post 26 Dec 2018, 16:04
We can exploit integer constraints here to deduce the right answer.
We can't have half a girl, or half a boy in class, so we need an integer.

Using the unknown multiplier rule:

3x + 5x = 8x = ?????

What answer choice is not divisible by 8?

Answer choice B
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Re: If the ratio of boys to girls in a class is 5 to 3, which of the follo   [#permalink] 26 Dec 2018, 16:04
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If the ratio of boys to girls in a class is 5 to 3, which of the follo

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