SOLUTION: John is presently 12 years older than Joseph. Four years ago John was twice as old as Joseph. How old is each now?

Question 565508: John is presently 12 years older than Joseph. Four years ago John was twice as old as Joseph. How old is each now?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = Joseph's age now
Let = John's age now
given:
(1)
(2)
-------------------
(2)
(2)
(2)
Substitute (1) into (2)
(2)
Subtract from both sides
(2)
Add to both sides
(2)
and, since
(1)
(1)
(1)
Joseph is 16 and John is 28
check:
(2)
(2)
(2)
(2)
OK
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