Answer:
42 days
Explanation:
To solve this problem one must find the Least Common Multiple (LCM) between the days it takes for both Sherman and Brad to go golfing (6 and 7)
Since 7 is a prime number the LCM, in this case, is the product of 7 by the other number:

It will be 42 days until Sherman and Brad will go golfing on the same day again.