If the least common multiple of a and b is 120, and the ratio of a to b is 3:4, then what is their greatest common divisor?
The gcd of a and b is 5.
a / b = 3 / 4
a = (3/4)b
Divisors of 120
1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120
a = 30 b = 40
gcd = 5
