[計量] If 55 percent of a group of people...
問一題數學...
想了好久...還是投降來問各位板上的高手...>"<
If 55 percent of a group of people have brown hair and 80 percent
of the same group do not have red hair, what fraction of those
who do not have brown hair have red hair?
(A) 1/4
(B) 4/11
(C) 4/9
(D) 5/9
(E) 4/5
Ans: A
請大家幫忙解題一下囉~
我卡住了>"<
謝謝..........
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