Ask the classroom length 9m. Width 6m. High 3m. With paint brush and roof. Remove window 24 square meters per square meter need paint 200
200X [9X6 + (9 + 6) X3X2-24] = 200X [54 + 90-24] = 200X120 = attention unit
Do you ask how much paint you need? 6 * 9 + 3 * 6 * 2 + 3 * 9 * 2-24 = 120 square meters, and then use 120 square meters by the amount of paint per square meter required on it. Such as 120 * 200 = 24kg
Your subject is not complete, hope to add a complete first to help you calculate the area to paint, the rest you can own it (9 +6) × 2 × 3-24 +9 × 6 = 15 × 6-24 +54 = 90 + 30 = 120 (square meters) behind will not count, please ask! wish you happy
