机警高频题急求

joannali623 · 发表于 2011-2-12 23:57:38

DS X个pumpers用Z分钟能够抽Y liters水来着，Y个pumpers用X分钟能够抽Z liters水，问1个pumper需要多少时间抽xyz liter水？字母顺序可能错了…
(1)x^2+y^2=…
(2)xy=…
虽然题目不确定，但我蛮确定这题选A…

楼主给的答案是A，但我个人认为是B。请大家帮我分析一下~ 急求，下周就考了！此题为高频题题呀。。。。。

sdcar2010 · 发表于 2011-2-13 01:01:37

Suppose each men can pump A liters of water per minute. Then:
1) X * A * Z = Y
2) Y * A* X = Z

And the question asks 1 man need how many minutes to pump X*Y*Z liter of water.

Answer = (X * Y * Z) / A

It is obvious that Y= Z.
So A = 1/X.
So Answer = X^2 * Y^2

Now you can analyze the two conditions given and decide which one can give your a definite number for X^2 * Y^2.

joannali623 · 发表于 2011-2-13 01:53:48

thank u. basically we two get the same process. so the answer should be b instead of a !

pageder · 发表于 2011-2-13 11:34:57

如果题目正按楼主列出的，我也觉得是选B

机警高频题急求

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