The construction team plans to build an expressway with a daily capacity of 4.5 kilometers, which will be completed within 20 days. In fact, it will be built with a capacity of 6 kilometers per day. How many days can it be finished?
3.200g seawater can produce 6g salt. According to this calculation, how many tons of salt can be dried by 6 tons of seawater?
4. Students do the questions, with 20 people in each row, which is exactly 18 row. If there are 4 people in each row, how many rows should I stand?
5. There is a pile of coal. If you burn 5 tons a day, you can burn 180 days. If you burn 4.5 tons a day, how many days can you burn?
6. A car can transport 450 tons of goods three times. According to this calculation, how many goods can a * * * carry after four times?
7. The school canteen is paved with square bricks. If square bricks with an area of 9dm2 are used, 48 bricks are needed. How many square bricks with an area of 16dm2 are needed?