3 (21+5)
The sum is 84 and the GCF is 6
The Greatest Common Factor is 3
You cannot. LCM{2,6,12} = 12 and GCF{2,6,12} = 2 LCM{4,6,12} = 12 and GCF{4,6,12} = 2 The two sets have the same LCM and GCF but, clearly, their sums are different.
3 is a common factor but not the Greatest common factor.
9(2 + 3)
7(7 + 9)
6 + 36
7(5 + 6)
The set of numbers given are not suited for this since 9 and 35 are co-prime so that the GCF of the given set of numbers is 1. Using a GCF of 1 does not help.
(2 x 9) + (3 x 9) = 5 x 9 = 45
The GCF of 75 and 90 is 15.
3(5 + 27)
9(2 + 3)
3 (21+5)
11(5 + 6)
5(8 + 5)