Question

What is the greatest common factor of 19x7 and 3x5?

Answer 1

I'd say 1 for this one.....because they do not have anything in common

Answer 2

19x7= 133 and 5x3=15. the factors of 15 are 1,3,5,15. so its one of those
if the question is "What is the greatest common factor of (19x)7 and (3x)5?" then the common factor would be 1x.