Question

L.C.M of two numbers is 120 and their H.C.F is 10,which of the following can be the sum of those two numbers

Answer 1

LCM(a,b)*HCF(a,b)=a*b
120*10=a*b
a=120. b=10
a+b=120+10=130

Answer 2

HI

L.C.M of two numbers is 120 and their H.C.F is 10

hcf is 10

if lcm is 120 then the 2 numbers is below  120

= > multiples of 10below  120 = 10,20,30,40...110

=>now in this a *b = 120*10

=> a*b =  1200

=> there are 2 possibilities

=>30 *40 = 1200

=> 10 *120 = 1200

 hcf of 10 and 120  = 10 and lcm is 120

in the same way  hcf of 30 and 40  = 10 and lcm is 120

hence the answers can be

10 ,120 or 30,40

thier sum can be 130 or 70

hope it helps u......