SOLUTION: The difference in Ron's age and Joan's age is 9 years. In 3 years, Ron will be twice as old as Joan. How old is each now?

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Question 1153388: The difference in Ron's age and Joan's age is 9 years. In 3 years, Ron will be twice as old as Joan. How old is each now?
Found 2 solutions by josgarithmetic, Edwin McCravy:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
r%2B3=2%28j%2B3%29
r%2B3=2j%2B6
r=2j%2B3

Ron's age must be more than Joan's.
r-j=9
r=9%2Bj
9%2Bj=2j%2B3
highlight%286=j%29-------------highlight%28r=15%29

Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
The difference in Ron's age and Joan's age is 9 years.
 
R - J = 9

In 3 years, Ron will be twice as old as Joan.
 
R + 3 = 2(J + 3)

system%28R-J=9%2C+R%2B3=2%28J%2B3%29%29

Simplify and solve the system of equations by substitution.

How old is each now?
  

You find out by solving the above.

Edwin