Question

What is the least number that is exactly divisible by 15, 10 and 16?

• A. 16
• B. 240
• C. 60
• D. 160

Answer 1

The correct option is B 240

The least number that is exactly divisible by 15, 10 and 16 is the LCM of the three numbers.

$\begin{array}{cc}2& 15,10,16\\ 2& 15,5,8\\ 2& 15,5,4\\ 2& 15,5,2\\ 3& 15,5,1\\ 5& 5,5,1\\ & 1,1,1\end{array}$
LCM of 15, 10 and 16 $=2\times 2\times 2\times 2\times 3\times 5=240$