They're both multiples of 60, which is their greatest common denominator (gcd).
The greatest common factor of the numbers 120 and 180 is 60.
10 is a factor of 20 and 30.
300
The product is: 180
60, 120 and 180, among others.
Because they are divisible by the most numbers.
60, 120, and 180.
60, 120, 180.....
1.5 x 120 = 180
The greatest common factor of the numbers 120, 180 and 240 is 60. The GCF can't be any larger than the smallest difference between the numbers, which is 60. It is easy to see that 60 is a factor of each of the numbers in the set, so it is the GCF.
120 + 60 = 180
180 divided by 120 =1.5=150%