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In a zoo, the ratio of the number of cheetahs to the number

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In a zoo, the ratio of the number of cheetahs to the number [#permalink] New post 07 Jul 2012, 21:52
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E

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Question Stats:

83% (01:58) correct 17% (01:02) wrong based on 41 sessions
In a zoo, the ratio of the number of cheetahs to the number of pandas is 1 : 3 and was the same five years ago. If the increase in the number of cheetahs in the zoo since then is 5, then what is the increase in the number of pandas?

(A) 2
(B) 3
(C) 5
(D) 10
(E) 15
[Reveal] Spoiler: OA

Last edited by Bunuel on 08 Jul 2012, 01:45, edited 1 time in total.
Edited the question.
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Re: In a zoo [#permalink] New post 07 Jul 2012, 23:15
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One short cut to solve the problem is

c:p = 1:3
c increased to 6
=> 1:3 = 6:x
=> x = 18
=>p increased by 15
E is the answer
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Re: In a zoo [#permalink] New post 08 Jul 2012, 01:24
farukqmul wrote:
In a zoo, the ratio of the number of cheetahs to the number of pandas is 1 : 3 and was the same five
years ago. If the increase in the number of cheetahs in the zoo since then is 5, then what is the
increase in the number of pandas?
A) 2
(B) 3
(C) 5
(D) 10
(E) 15

Hi,

Ratio of cheetah to panda = 1:3
or \frac {x}{3x}
so, if number of cheetah increases by 5 such that the ratio must remain same, then
\frac {x+5x}{3(x+5x)} = \frac {x+5x}{3x+15x}
so increase in the number of panda would be in multiple of 15.

Thus, Answer (E)

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Re: In a zoo, the ratio of the number of cheetahs to the number [#permalink] New post 27 Jul 2012, 03:02
Consider the number of cheetahs = 10;...> no of pandas=30
Therefore if number of cheetas is 5 more=10+5=15 then pandas must be 3 times more=15*3=45.
Increase in the number of pandas=45-30=15

Ans-D
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Re: In a zoo, the ratio of the number of cheetahs to the number   [#permalink] 27 Jul 2012, 03:02
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