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judy is 10 and her sister is 12 .in how many years will their ages total 38
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judy is 10 and her sister is 12 .in how many years will their ages total 38
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答案和解析
judy 10岁
她姐姐 12岁
几年后他们的年龄和为 38
(38-10-12)/2 = 8
8年后
她姐姐 12岁
几年后他们的年龄和为 38
(38-10-12)/2 = 8
8年后
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