Answer:
The team will need to buy 5 packs.
Explanation:
How many more balls they need?
They have 57 baseballs. They need 72.
72-57 = 15
So they need 15 more baseballs
How many more packs?
One pack has 3 balls.
How many packs are needed for 15 balls?
We solve this using a rule of three.
1 pack - 3 balls
x packs - 15 balls
3x = 15
x = 15/3
x = 5
The team will need to buy 5 packs.