Final answer:
To find out how many golf balls Jack has now, we can add the initial number of golf balls to the number of golf balls his friend gave him.
Step-by-step explanation:
To solve this problem, we need to add the number of golf balls Jack had initially and the number of golf balls his friend gave him. Jack had three bags of golf balls, so we can assume that each bag had the same number of golf balls. Let's say each bag had x golf balls. So, initially, Jack had 3x golf balls. When his friend gave him six more golf balls, we can add 6 to the initial number of golf balls. Therefore, Jack now has 3x + 6 golf balls.