Hi,

the sum of brother and sister age is 8 year

 sister is 7 years younger than her brother...  

Note: 

 sister 6 months old, bother old 

Answer by richwmiller(17219)   (Show Source): You can put this solution on YOUR website!
 b+s=8

s=b-7

b+b-7=8

2b=15

b=7.5

s=.5



 

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