Question

Find the lcm of a and b if ab=1800 and hcf of a and b is 15

Answer 1

u already know dat 
product of two numbers = HCF of two numbers * LCM OF two numbers 

so let ab be two numbers 

if ab = 1800 and hcf of a,b =15 

ab =hcf of a,b *lcm of a,b 

1800=15*lcm of a,b 

so 1800/15= lcm of a,b 

120 =lcm of a,b 

so lcm of a,b is 120 

hope u will understand in easy way

Answer 2

a × b = HCF × LCM
1800 = 15 × LCM
LCM. = 1800/15
=> LCM = 120