SOLUTION: When Peter is 10 years old, his father is 4 times as old as he is. How old will Peter be when his father is 3 times as old as he is ?

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Question 944754: When Peter is 10 years old, his father is 4 times as old as he is. How old will Peter be when his father is 3 times as old as he is ?
Answer by RyuSlender(3) About Me  (Show Source):
You can put this solution on YOUR website!
It should be that Peter is 20