Question

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?

Answer 1

sam+1=pat，alan=1/2sean,alan+3=sam,sam=11,所以当pat15岁时，sean是19岁

Answer 2

Pat,Sean,Alan,Sam四个孩子今天都举行了生日聚会，再过一年，Sam 就和现在的Pat一样大了。Alan的年龄是Sean的一半大，并且比Sam小三岁，Sam十一岁，当Pat十五岁的时候，Sean会是几岁呢？