SOLUTION: Jack is 4 years older than Jill. Seven years from now the the sum of their ages will be 60. How old is Jill now?

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Question 701892: Jack is 4 years older than Jill. Seven years from now the the sum of their ages will be 60. How old is Jill now?
Answer by mozilla(1) About Me  (Show Source):
You can put this solution on YOUR website!
jill = x years
jack = x+4
hence after 7 years
jill= x + 7
jack= x+4+7
= x+11
so Jack= x+11
and jill= x+7
The sum of both must equal 60
x+11+x+7=60
Solve for x
2x+18=60
2x=42
x=21
Jill is 21