1. Mr. Jackson  cleaned 52 of the 61 cars. How many are still to be cleaned?   2. A truck drove under a bridge 7 m high. There was a gap of 4 m between the top of the truck and the bridge. How many meters was the truck in height?   3. A milk van started with 89 bottles of milk. It delivered 81 bottles. How many bottles are still to be delivered?   4. Jack  has to repair 31 cabs. He has repaired 6. How many more does he have to repair?   5. Mrs. Simon has 8 gallons of fuel in her car. Her fuel tank has a capacity of 17 gallons. How many gallons are needed to fill the fuel tank?