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标题: Math-3rd root of W? [打印本页]

作者: chaihuo 时间: 2002-11-29 06:52 标题: Math-3rd root of W?

i came across this problem:

what is value of W third root?
1), W fifth root is 64
2), W fifteen root is 4

thought the answer whould be D, but noticed someone said it is B. Can you help to sovle this?

Thx

作者: guqing28 时间: 2002-11-29 08:34

From (1), we can reason that W~1/5 = 64 = 2 ~6, then W = 2 ~30, so W~1/3 = 2~10

From (2), that W~1/15 = 2~2 then W = 2 ~30 so w~1/3 = 2~10

the correct choice id ( D)

[此贴子已经被作者于2002-11-29 8:34:05编辑过]

作者: chaihuo 时间: 2002-11-29 21:59

Thanks, there.

作者: rjch 时间: 2002-12-2 22:05

Just a reminder, you do not need to calculate the result in real test. When you know that you can get it from either condition, choose D and move on. Time is precious.

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