The product of two whole numbers is 1500 and their HCF is 10. Find the LCM = ?

Answer: Option B

Product of two numbers = 1500, HCF = 10
$$\begin{array}{rl}& \text{LCM}\\ & \text{ = }\frac{\text{Product of two numbers}}{\text{Their HCF}}\\ & =\frac{1500}{10}\\ & =150\\ & \text{Required LCM is 150}\end{array}$$