the length breadth and height of a room are 6m 5m 4m respectively.Find the cost of whitewashing the walls of the room and the ceiling at the rate of Rs 7.50 per sq.m
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8
Answer:
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Length, breadth and height of a room are 5 m, 4 m and 3 m.
Area of four walls of the room =2h(l+b)
=2×3(5+4)
=6(9)
=54 sq m
Area of the ceiling =l×b
=5×4
=20 sq cm.
Total area of the four walls and the ceiling of the room
=54+20
=74 sq cm
Cost of white washing = Rs 7.50 per sq m
Total cost of white washing =74×7.50= Rs 555
Answered by
3
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
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