Question

Je suis un nombre entier compris entre 809 et 829. Je suis dovisible par 2 et 3, mais pas par 4 ni par 9. Qui suis-je?

Answer 1

Je suis 822.

Explanation:

The required number must be divisible by 2, so it will be even and as it is also divisible by 3, the sum of its digits will be a number divisible by 3.

So the number could be one of the following:

810, 816, 822. 828.

810 is divisible by 9.

816 is divisible by 4.

822 is not divisible by 4 or 9.

828 is divisible by 4.