1. Mr. Stewartcleaned 13 of the 23 buses. How many are still to be cleaned?   2. It is possible to accommodate 143 cars in a parking lot. If 73 cars are already parked, how many more cars can fit?   3. A milk van started with 818 bottles of milk. It delivered 47 bottles. How many bottles are still to be delivered?   4. Graham has to repair 34 cabs. He has repaired 21. How many more does he have to repair?   5. There are 264 passengers in a train. If79 people get off at the station, how many passengers are still there in the train?