[計量] PP1-DS-41
看板GMAT (GMAT入學考試)作者clearfuture (really?)時間16年前 (2009/11/19 20:39)推噓1(1推 0噓 3→)留言4則, 2人參與討論串1/2 (看更多)
Machines X and Y work at their respective constant rates.
How many more hours does it take machine Y, working alone,
to fill a production order of a certain size than it takes
machine X, working alone?
(1) Machines X and Y, working together, fill a
production order of this size in two-thirds the
time that machine X, working alone, does.
(2) Machine Y, working alone, fills a production
order of this size in twice the time that machine X, working alone, does.
(解)
設work=1, machineX=Xhour, machineY=Yhour, 問y-x=?
(1) 1/X + 1/Y = 2/3 ^ 1/X
(2) 1/Y = 2^ 1/X
答案是E
可是直覺上兩個變數，配上兩條式子，為什麼不是C ?tt.cc)
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