Question

The LCM of two numbers is 21 and their HCF is 1. If one of the numbers is 3, then
what is the other number?​

Answer 1

Answer:

The other number is 7.

Step-by-step explanation:

We know that if a and b are two numbers,

$a*b=LCM(a,b)*HCF(a,b)$

Then,

$3*x=21*1$

Hence, x=7

Therefore, the other number is 7.

Hope it helps.