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Class 9
>>Maths
>>Surface Areas and Volumes
>>Surface Area of Cubes and Cuboids
>>The length, breadth and height of a room
Question
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The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost white washing the walls of the room and ceiling at the rate of Rs. 7.50 per m
2
.
Medium
Solution
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Given:
L=5 m, B=4 m, H=3m
⇒Area to be white-washed = Area of cuboid − Area of base.
=2lh+2bh+2lb−lb
=2lh+2bh+lb
=[2×5×3+2×4×3+5×4]m
2
=74m
2
Cost of white washing per m
2
area = Rs.7.50
Cost of white washing 74m
2
area=74×7.50
= Rs.555
