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标题: 大家说这道题怎么做呢？？谢谢 [打印本页]

作者: hhl3000 时间: 2006-3-6 16:11 标题: 大家说这道题怎么做呢？？谢谢

If the average (arithmetic mean) of the assessed values

of x houses is $212,000 and the average of the assessed

values of y other houses is $194,000, what is the average

of the assessed values of the x+y houses?

(1) x+y=36

(2) x=2y

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