SOLUTION: The sum of a brother and sister age is 8 years. If the age of the sister is 7 years younger than the brother, what are their ages?

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Question 632066: The sum of a brother and sister age is 8 years. If the age of the sister is 7 years younger than the brother, what are their ages?
Found 2 solutions by ewatrrr, richwmiller:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

the sum of brother and sister age is 8 year

 sister is 7 years younger than her brother...  

Note: 7%261%2F2+%2B+1%2F2+=+8

 sister 6 months old, bother 7%261%2F2yrsold

Answer by richwmiller(17219) About Me  (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