Diophantus Updated

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Diophantus Updated




Amanda is $21$ years older than her son John.

In $6$ years from now, Amanda will be $5$ times as old as John.

Question
Where is John's father?


Click here for solution

Historical Note

The source of this joke is unknown.

If anyone knows where it first appeared, drop $\mathsf{Pr} \infty \mathsf{fWiki}$ a line.