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ratio

by hakyology » Thu Jul 03, 2008 9:38 am
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?

Please explain. Thank you.
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Re: ratio

by parallel_chase » Thu Jul 03, 2008 10:00 am
hakyology wrote: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?

Please explain. Thank you.
Is the answer 4:21
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by hakyology » Thu Jul 03, 2008 10:14 am
The answer is 9/14. this question makes me ill but i guess i have to know. does anybody know how to do this?
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by rprasanna » Thu Jul 03, 2008 11:42 am
40% male and 60% female in total rats (say X)
30% male and 70% female in dead rats (say Y)

death rate ratio male:female= (0.3Y/0.4X)/(0.7Y/0.6X) = 9/14
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