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Forty percent of the rats included in an experiment were

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Forty percent of the rats included in an experiment were [#permalink] New post 09 Feb 2004, 11:47
Forty percent of the rats included in an experiment were male rats. If some of the rats died during the experiment and 30 percent of the rats that died were male rats, what was the ratio of the death rate among the male rats to the death rate among the female rats?

(A) 9/14 (B) 3/4 (C) 9/11
(D) 6/7 (E) 7/8
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Attain Moksha

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 [#permalink] New post 09 Feb 2004, 11:52
Ans: A

The key is death rate, which is number of dead rat to total number of rate.

Last edited by kpadma on 09 Feb 2004, 14:18, edited 2 times in total.
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 [#permalink] New post 09 Feb 2004, 13:11
Let T be total rats, M are male, F are female, D be total rats dead, MD male dead, FD female dead

M = 0.4T F = 0.6T
MD = 0.3D FD = 0.7D

Death rate of male = x = 0.3D/0.4T
Death rate of female = y = 0.7D/0.6T
x/y = 0.3D/0.4T * 0.6T/0.7D = 9/14

I believe answer should be A.
  [#permalink] 09 Feb 2004, 13:11
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