Dennis initially had 10 rocks.
His fish ate half of them, so he has 10/2 = 5 rocks left.
The fish spit out two rocks, so he now has 5 + 2 = 7 rocks left.
#### 7
The answer is: 7
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
Dennis collected 10 rocks. He put all of them in his aquarium but his fish ate half of them. He was able to make the fish spit two out. How many of Dennis's rocks are left?

### Answer:
