A room needs to be painted with an area of 60 square meters. According to experience, when painting for the first time, 0.5 kg of paint is used for each square decimeter, and when painting for the second time, The paint used per square meter is 2 / 3 of the first time. How many kg of paint is needed for two times of painting?

The area of a room to be painted is 60 square meters. According to experience, when painting for the first time, 0.5 kg of paint is used per square decimeter. When painting for the second time, 2 / 3 of the paint per square meter is used for the first time
60 * 5 * 0.5/3 = 50kg
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