A classroom is 8 meters long, 6 meters wide and 3.5 meters high. Now we must paint the walls and ceiling of the classroom. The area of doors, windows and blackboards is 22 square meters, with an average of 0.25 kg of paint per square meter. How many kilograms of paint does it take to paint this classroom?

(8+6) * 2 * 3.5+8 * 6-22 * 0.25 = 31kg

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