珍珠湾ART

标题: a brain teaser [打印本页]

作者: HF: 时间: 2007-12-16 18:40
标题: a brain teaser

The combined ages of a monkey and its mother are 4Years. (Now, take a deep breath

) The mother is twice as old as the monkey was when the mother was half as old as the monkey will be when the monkey is three times as old as its mother was when she was three times as old as the monkey was.

How old is the monkey?

作者: 开开心心 时间: 2007-12-16 18:45
标题: 4Years 是什么意思？[:-D]

4Years 是什么意思？

作者: husonghu 时间: 2007-12-17 04:34
标题: 猴母比猴子大.....

猴母比猴子大12个月, 所以现在:

猴母 is 30 months old

猴子 is 18 months old

(30 months + 18 months = 4 years)

The key point is to find out the age difference (12 months), which is deduced from this sentence:

The mother is (30 months old) twice as old as the monkey was (15 months old) when the mother was (27 months old) half as old as the monkey will be (54 months old) when the monkey is three times as old as its mother was (18 months old) when she was three times as old as the monkey was (6 months old).

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