Question

A number is divisible by 12. By what other numbers will that number be divisible?

Answer 1

If a number is divisible by any given number (say $a$), then the number is also divisible by all the factors of $a$.
Factors of 12 are 1, 2, 3, 4, 6 and 12.
Therefore, the number will also be divisible by 1, 2, 3, 4, and 6.