SOLUTION: Jack is 4 years older than Jill. Seven years from now the the sum of their ages will be 72. How old is Jill now?

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Question 396548: Jack is 4 years older than Jill. Seven years from now the the sum of their ages will be 72. How old is Jill now?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
jill = x years
jack = x+4
...
after 7 years
jill =x+7
jack = x+4+7=x+11
..
x+11+x+7= 72
2x+18=72
-18
2x=54
x= 23 years jill's age
jack's age = 27