Re: [計量] 求一題 GWD數學感謝
: Q13:
: Company S produces two kinds of stereos: basic and deluxe. Of the stereos
: produced by Company S last month, 2/3 were basic and the rest were deluxe.
: If it takes 5/7 as many hours to produce a deluxe stereo as it does to
: produce a basic stereo ,then the number of hours it took to produce the deluxe
: stereos last month was what fraction of the total number of hours it took to
: produce all the stereos?
: ANS:7/17
首先算 deluxe 和 basic 的製造時間比 = 7/5 : 1 = 7 : 5
產量乘以時間=
(7*1/3)/(7*1/3 + 5*2/3) = 7/17
想問一下這一題...最後為何要用產量X時間呢?
不能直接用時間比例去比嗎??
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