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A laboratory has 55 rabbits, some white and the rest brown. Which of t

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A laboratory has 55 rabbits, some white and the rest brown. Which of t  [#permalink]

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New post 13 Jan 2019, 11:26
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A
B
C
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E

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  15% (low)

Question Stats:

91% (00:45) correct 9% (00:35) wrong based on 34 sessions

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A laboratory has 55 rabbits, some white and the rest brown. Which of the following could be the ratio of white rabbits to brown rabbits in the lab?

A. 1:3

B. 3:8

C. 5:11

D. 3:4

E. 5:1

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Re: A laboratory has 55 rabbits, some white and the rest brown. Which of t  [#permalink]

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New post 13 Jan 2019, 21:05
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A laboratory has 55 rabbits, some white and the rest brown. Which of the following could be the ratio of white rabbits to brown rabbits in the lab?

The total has to be 55, so the ratio has to be a multiple of 5 or 11 or both. Let the common ratio be x

A. 1:3.......Total =x+3x=4x=55.....x is not an integer... eliminate

B. 3:8.......Total =8x+3x=11x=55.....x is an integer... YES

C. 5:11.......Total =5x+11x=16x=55.....x is not an integer... eliminate

D. 3:4.......Total =4x+3x=7x=55.....x is not an integer... eliminate

E. 5:1.......Total =5x+x=6x=55.....x is not an integer... eliminate

Therefore, the answer is B.
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Re: A laboratory has 55 rabbits, some white and the rest brown. Which of t  [#permalink]

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New post 13 Jan 2019, 21:19
B) 3:8

3+8= 11

And 55/11=5= an integer.

This is the only option where we get an integer.. So this is the only possible answer.

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Re: A laboratory has 55 rabbits, some white and the rest brown. Which of t   [#permalink] 13 Jan 2019, 21:19
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