Classroom length of 9 meters, 7 meters wide, 3.3 meters high, to paint the walls of the classroom and the roof, doors and windows and blackboard the total area is 20 square meters. If every nail nail filling to kill ghost cool Handan whale square meters need to paint 0.8 kg, then the whitewash of this classroom at least how many kilograms of paint? More
(9 * 7 + 9 * 3.3 + 3.3 * 7) * 2 = 113.8 square meters 113.8-20 = 93.8 square meters 93.8 * 0.8 = 75.04 kg
9x3.3 = 29.77x3.3 icing nail filling the ghosts to kill ghosts cool saddle whale = 23.1 (29.7 + 23.1) x2 + 9x7 = 52.8x2 + 63 = 105.6 +63 = 168.6 square meters 168.6-20 = 148.6 square meters 148.6x0 .8 = 117.44 kg
(9 × 7 +9 × 3.3 × 2 + 7 × 3. Ji nail filling irrigation to change ghost cool natural whale 3 × 2-20) × 0.8 = 148.6 × 0.8 = 118.88 kg
