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?

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

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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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