Lin bought 4 bags of apples. Each bag had the same number of apples. After eating 1 apple from each bag, she had 28 apples left.

Describe how you would find the unknown amount in the story

To find the unknown amount of apples in each bag, we can set up the following equation:

Let x be the number of apples in each bag.

4x - 4 = 28

Simplify the equation:

4x - 4 = 28
4x = 32
x = 8

Therefore, there were 8 apples in each bag originally.