Question

A 2-digit number is twice the difference of its digits. What is the number?

Answer 1

I suspect a typo. The difference cannot be more than 9, so the number must be at most 18.

It is even, so the only candidates are

10 12 14 16 18

None of those works.

Answer 2

It is impossible. 12, 14, or 16 may work, but I think you should give up on this equation...