Given:
Let 10a and 10b be the two numbers where a and be are coprimes.
LCM OF TWO NUMBERS= 120
HCF= 10
LCM =10 ab = 120
ab =12
Therefore possible pairs could be :
(3,4) or ( 1,12)
Hence numbers can be 30 and 40 and their sum is 70.
Hence option d is correct.
