neeti2711 wrote:Forty percent of the rats included in an experiment were male rats. If some of the rats died during 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
Let the total number of rats = 100.
Male rats = .4(100) = 40.
Thus, female rats = 100-40 = 60.
Let the total number of deaths = 10.
Male deaths = .3(10) = 3.
Thus, female deaths = 10-3 = 7.
Male death rate = (male deaths)/(total males) = 3/40.
Female death rate = (female deaths)/(total females) = 7/60.
Male death rate / female death rate = (3/40) / (7/60) = 3/40 * 60/7 = 9/14.
The correct answer is
A.
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