SOLUTION: The sum of the ages of Joe and Jim is 28. Seven years from now, Joe will be twice Jim's age. What is Joe's present age?

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Question 318601: The sum of the ages of Joe and Jim is 28. Seven years from now, Joe will be twice Jim's age. What is Joe's present age?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be Joe's age now, B Jim's age now.
1.A%2BB=28
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.
.
In 7 years, Joe will be A%2B7, Jim will be B%2B7
A%2B7=2%28B%2B7%29
A%2B7=2B%2B14}
2.A-2B=7
Subtract eq. 1 from eq. 2,
A-2B-A-B=7-28
-3B=-21
highlight%28+B=7%29
Then from eq. 1,
A%2B7=28
highlight%28+A=21%29
.
.
.
Jim is now 21 and Joe is now 7.