If Don buys 150 bottles from Shop A and 180 bottles from Shop B, then he has already bought a total of 150 + 180 = 330 bottles.
If he can only buy a total of 550 bottles, then he can buy an additional 550 - 330 = 220 bottles.
Therefore, Don can buy 220 bottles from Shop C.
#### 220
The answer is: 220
Below is a math problem. Provide a detailed, step-by-step solution.

### Problem:
If Don buys 150 bottles from Shop A and 180 bottles from Shop B in a small town, how many bottles does he buy from Shop C if he can only buy a total of 550 bottles?

### Answer:
