A room is 8.5 m long, 7m broad and 4 m high. It has one door measuring 1 m by 1 m and two windows each measuring .5 m by.5 m. Find the cost of painting its four walls without door and windows, if the rate of painting is rupees 2 per square metre.
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Step-by-step explanation:
Area of the walls to be painted= Area of 4 faces of the room - Area of the door- Area of 2 windows
=7× h+7× h+5× h+5× h−(2×1.5)−(1.5×1)−(1.5×1)=24h−3−3=24h−6
Area of wall painted=Cost of painting the wallCost of painting 1 sq.m of the wall
=82512.5=66sq.m
Thus, 24h−6=66
⇒ 24h=72
⇒ h=7224=3m
Thus the height of the room is 3m.


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