1. Mr. Lee  cleaned 31 of the 39 buses. How many are still to be cleaned?   2. A truck drove under a bridge 7 m high. There was a gap of 2 m between the top of the truck and the bridge. How many meters was the truck in height?   3. A milk van started with 63 bottles of milk. It delivered 54 bottles. How many bottles are still to be delivered?   4. Andy  has to repair 24 cabs. He has repaired 5. How many more does he have to repair?   5. Mrs. Young has 6 gallons of fuel in her car. Her fuel tank has a capacity of 15 gallons. How many gallons are needed to fill the fuel tank?