SOLUTION: John is 3 years older than his sister. His mother is 26 years older than John. His father is 4 years older than his mom. The average of both parents age is the sum of his age and

Question 1144129: John is 3 years older than his sister. His mother is 26 years older than John. His father is 4 years older than his mom. The average of both parents age is the sum of his age and his sister's age combined. How old is his sister?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!

John             x+3
Sister           x
Mother           x+29
Father           x+33
Average M&F      (2x+29+33)/2
John+x           2x+3

Other ways to follow the description into expressions are possible. Here, just one variable is used, x for the sister.

Solve.
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