A cuboid tank is 20 meters long, 15 meters wide and 2 meters deep. (1) the floor area of the tank? (2) the four walls and bottom of the tank are plastered with cement to calculate the area of cement? (3) how many tons of oil can be stored at most when the tank is used to store 0.85 tons of oil per cubic meter?

A cuboid tank is 20 meters long, 15 meters wide and 2 meters deep. (1) the floor area of the tank? (2) the four walls and bottom of the tank are plastered with cement to calculate the area of cement? (3) how many tons of oil can be stored at most when the tank is used to store 0.85 tons of oil per cubic meter?

1.20*15=300
2.(20*2+2*15)*2+20*15=440
3.20*15*2*0.85=510