Question

LCM OF TWO NUMBER a and b is x. FIND HCF

Answer 1

numbers are a and b.
LCM of a and b = x

we know that product of two numbers is equal to the product of their LCM and HCF. Let the HCF be y. thus,

$a*b=x*y\\y= \frac{ab}{x} \\ \\ HCF=\boxed{ \frac{ab}{x}}$

Answer 2

as product of numbers = lcm * hcf 
therefore a * b=x*hcf
             hcf = a*b/x