SOLUTION: My puzzle: A father’s age is 4 times than his son. After 10 years, son’s age becomes 0 (zero). How?

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Question 1141112: My puzzle: A father’s age is 4 times than his son. After 10 years, son’s age becomes 0 (zero). How?
Found 2 solutions by josgarithmetic, Alan3354:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
The description seems unrealistic.

4x, Father
x, Son
In ten years, x=0, not realistic

x%2B10=0
x=-10
-
4x=-40
-

No sensible meaning. Father would be at any time, of less age than son, which is nonsense. -40%3C-10.

Nonsense.

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Maybe the son dies.
Does a dead person have an age?