HCF and LCM of two numbers are 3 and 18 respectively. If one of them is 9, find the other number.

Correct option is A

Given:

LCM of two numbers = 18

HCF of two numbers = 3

One of the numbers = 9

Formula Used:

The product of two numbers is equal to the product of their LCM and HCF.

Solution:

Let the two numbers be 'a' and 'b'. We are given that a = 9

Using the formula: a $$\times$$​ b = LCM$$\times$$HCF​

$$9 \times$$b = 18 $$\times$$3

b =$$\frac{(18\times 3) }{ 9}$$= 6

Therefore, the other number is 6