问答题In 10 years the ages of two brothers and two sisters will total 100. How much will their ages total in 7 years?

问答题
In 10 years the ages of two brothers and two sisters will total 100. How much will their ages total in 7 years?

参考解析

解析:
共有4个人,每年的年龄增长总数为4,3年的年龄增长总数为12。100-12=88。

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