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Forty percent of the rats included in an experiment were [#permalink]
26 Aug 2003, 13:09
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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?
I have a little different approach. Please note that 30% of the rats that died were male and 70% are female. The male rats that died are30%x40%=12% and for female rats is 60%x70%=42% or 12/40 death rate for male rats and 42/60 death rate for female rats. The desired ratio is 12/40 divided 42/60 which is 12/40x60/42=3/7. ...may be I am wrong since you all get 9/14 as a ratio
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