SOLUTION: Mark is 13 years older than John. In 9 years, Mark will be twice as old as John. How old is John?

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Question 293730: Mark is 13 years older than John. In 9 years, Mark will be twice as old as John. How old is John?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
m=j+13
(m+9)=2*(j+9)
(j+13+9)=2*(j+9)
j+22=2j+18
4=j
check
m=j+13=17
17+9=2*(13)
26=26
ok