human
Don buys recyclable bottles in a small town. Shop A normally sells him 150 bottles, shop B sells him 180 bottles and Shop C sells him the rest. How many bottles does Don buy from Shop C if he is capable of buying only 550 bottles?
assistant
How many bottles does Don buy from Shop A and B? ** Between Shop A and Shop B he buys 150 bottles+180 bottles=<<150+180=330>>330 bottles
How many bottles does Don buy from Shop C? ** Thus he can buy 550 bottles-330 bottles=<<550-330=220>>220 bottles from shop C
#### 220