the length,Breadth and height of a room are 5 m ,4m and 3m respectively. Find the cost of white washing the walls and the ceiling at the rate of RS.7.50 per m2.
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Answer:
The length, breadth and height of a room are 5 m, 4m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per m2.
Expert Answer:
Area to be whitewashed does not include the floor.
Therefore, area to be whitewashed
= Area of four walls + area of the ceiling
= 2 (l + b) h + l b
= [2 (5 + 4) 3 + 5 4] m
=54 + 20 m2
= 74 m2
Cost of white washing = Rs 7.50 74 = Rs 555
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✌The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of Rs 7.50 per sq m.
✌ANSWER
➡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
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