Answer:
We have now seen solutions method for the three basic types of percent problems ;finding the amount, the rate, and the base
6 because it is the highest and goes into 12 twice and 90 15 times
ANSWER
The greatest common factor is

EXPLANATION
We want to find the greatest common factor of

and

The prime factorizations are;

and

The product of the least powers of the common factors is the greatest common factor.