20. 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
Visit comments section for Answer and Explanation.
Assume:
ReplyDeleteMale Rats: 40
Female Rats: 60
Dead Male Rats: .3x
Dead Female Rats: .7x
Therefore:
Death rate male rats: .3x/40
Death rate female rats: .7x/60
Ratio of death rate male rats/female rats =
(.3x/40)*(60/.7x) = 9/14
Hence answer A