SOLUTION: Hi Mr Lee is 3 times as old as his son. Their total age is 56. How old was Mr Lee when he was 5 times as old as his son. Thanks

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Question 1175716: Hi
Mr Lee is 3 times as old as his son. Their total age is 56. How old was Mr Lee when he was 5 times as old as his son.
Thanks
Answer by ikleyn(52858) About Me  (Show Source):
You can put this solution on YOUR website!
.

From the condition, it is easy to get it mentally, that 
their current age is 14 years and 42 years.


Or, formally,  x + 3x = 56  implies the same.



Next, considering divisibility by 5, only the age of 35 does suit for the father.


ANSWER.  It happened 7 years ago.

Solved.