2 and 4
The numbers are 34 and 51, which have a sum of 85 and their LCM is 102, the multiple of the highest power of their prime factors 2, 3, 17.
14 and 21 have a sum of 35 and an LCM of 42
16 and 12 how did you get it
16 and 24
Their product.
60 and 36
16 and 3
16 and 3
16 and 3
40 and 50
How about: 18 and 24
HCF of 17 and 68 is 17 ..( Lowest Prime factor ) LCM Of 102 and 476 is 7*2^2*3*17 which is 1428 .. ==> Sum of HCF and LCM are 1428+17= 1445 .