judy is 10 and her sister is 12 .in how many years will their ages total 38
问题描述：
judy is 10 and her sister is 12 .in how many years will their ages total 38
答
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