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Four children,Tony,Jim,Mary and Kate,all have a birthday party.In one year's time Kate will be the age Tony is now.Mary is half of Jim's age and is three years younger than Kate.Kate is 11 year's old.What age will Mary be when Kate is 15 years old.

题目详情
Four children,Tony,Jim,Mary and Kate,all have a birthday party.In one year's time Kate will be the age Tony is now.Mary is half of Jim's age and is three years younger than Kate.Kate is 11 year's old.What age will Mary be when Kate is 15 years old.
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答案和解析
现在有4个小孩,Tony,Jim,Mary 和kate.大家都在开一个生日聚会.一年后kate 就和今年的tony 同龄了.Mary 的年龄是Jim 的一半,而且比Kate 小三岁.kate 今年11岁,请问 kate 15岁的时候mary多大.
答案 12岁 因为mary 永远比kate小三岁.