问题描述：
Four children Pat,Sean,Alan,Sam,all have birthday parties today,in one year's time Sam will 怎么解
Four children Pat,Sean,Alan,Sam,all have birthday parties today,in one year's time Sam will be at the age of Pat now.Alan is half of Sean's age and three years younger than Sam,Sam is 11 years old.what age will Sean be when Pat is 15 years old?
Four children Pat,Sean,Alan,Sam,all have birthday parties today,in one year's time Sam will be at the age of Pat now.Alan is half of Sean's age and three years younger than Sam,Sam is 11 years old.what age will Sean be when Pat is 15 years old?
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