Which number is divisible by 12? (It must be divisible by both 3 and 4.)

12 = $3\times 4$, so the number must pass both tests. 132: digit sum 1 + 3 + 2 = 6 (divisible by 3) and last two digits $32=4\times 8$ (divisible by 4). So 132 is divisible by 12.