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.

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.