If the greatest common factor of two numbers is 7 and the least common multiple is 42, one of them is 21 and the other is what

If the greatest common factor of two numbers is 7 and the least common multiple is 42, one of them is 21 and the other is what

42=2*3*7
21=3*7
The greatest common factor is 7, so the other number is 2 * 7 = 14
The answer is 14