Question

Find the highest number which divides 24, 30 and 36.

• A. 3
• B. 6
• C. 24
• D. 12

Answer 1

The correct option is B 6

To find the highest number which divides 24, 30 and 36 we have to find the HCF of 24, 30 and 36.

$\begin{array}{cc}2& 24,30,36\\ 3& 12,15,18\\ & 4,5,6\end{array}$

Since there are no common factors for 4, 5, 6 we cannot factorise it further.

Hence,
$\text{HCF}=2\times 3=6$