Question

Which of the following is a multiple of both 12 and 6?

• A. 30
• B. 18
• C. 48
• D. 42

Answer 1

The correct option is C 48

$48=4\times 12$
$48=6\times 8$

$\therefore$ 48 is a common multiple of 12 and 6.

30, 18 and 42 are multiples of 6, but not of 12 and therefore, are not common multiples of 6 and 12.