1. Mr. Nelsoncleaned 11 of the 27 buses. How many are still to be cleaned?   2. It is possible to accommodate 138 cars in a parking lot. If 75 cars are already parked, how many more cars can fit?   3. A milk van started with 512 bottles of milk. It delivered 58 bottles. How many bottles are still to be delivered?   4. John has to repair 45 cabs. He has repaired 20. How many more does he have to repair?   5. There are 280 passengers in a train. If90 people get off at the station, how many passengers are still there in the train?