第1个回答 2007-03-22
有1/3了?``天呀``我都跟不上潮流了```55~~
第2个回答 2007-03-22
10:4
第3个回答 2007-03-22
1/3.
reason: 15 to 40 year olds: 40 - 15 = 25, 25 / 75 (expected life span) = 1/3
reason: 15 to 40 year olds: 40 - 15 = 25, 25 / 75 (expected life span) = 1/3
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