SOLUTION: Trying to solve this with my children... Problem: Mr. Black is three times as old as his son Jerry. Nine years ago he was nine times as old as Jerry. Solution suppose to be

SOLUTION: Trying to solve this with my children... Problem: Mr. Black is three times as old as his son Jerry. Nine years ago he was nine times as old as Jerry. Solution suppose to be

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Question 589540: Trying to solve this with my children...
Problem:
Mr. Black is three times as old as his son Jerry. Nine years ago he was nine times as old as Jerry.
Solution suppose to be (according to the teacher manual):
3x-9=9(x-9)
I cannot figure out why...
Please help
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
answered?
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