Think of a Number/Examples/Rhind Papyrus 28/Mistake

Source Work

 * The Puzzles:
 * Think of a Number: $7$
 * Think of a Number: $7$

Mistake

 * Problem $29$ of the Rhind papyrus is not quite so clear, but it is plausibly the first ever 'Think of a Number' problem. It reads ...

Correction
According to, which cites, this is actually Problem $28$.

It also needs to be pointed out that there are a number of such problems of a similar nature in this section of the, so this particular instance cannot really be considered to be "the first ever".