A math problem in grade five, come on! Reward 5 points!

1) Top surface 40×25= 1000 (m2)

Wall (40+25)×2×5-50=600 (m2)

The total wall area to be painted in the warehouse is 600 square meters.

The total area of the wall and top surface to be painted in the warehouse is: 1600 (m2).

2) Coating required1600× (0.8+0.1) =1440 (liter).

1) 200 yuan per 50 liters 1440÷50=28 (barrel) 28×200=5600 (yuan).

Second, every 30 liters 135 yuan 1440÷30=48 (barrel) 48× 135=6480 (yuan).

4) It takes about 330 liters of paint to paint the walls of the office, 330÷50=6.6 (barrels).

6 barrels× 50 = 300 (l)1barrel× 30 = 30 (l) a * * * 330l.

6× 200+/kloc-0 /×135 =1335 (yuan)