Given:
The pair of composite numbers: 10 and 15
To find:
The greatest common factor (GFC) for the given pair of composite numbers.
Solution:
Two composite number are 10 and 15.
The factor forms of these two numbers are
It is clear that the common factor is 5 in both factor forms. So, the greatest common factor is
Therefore, the greatest common factor of 10 and 15 is 5.