Find the area of 4 walls of a cuboidal room with length 35 m, breadth 30 m and height 28 m.
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It is given that length, breadth and height of a room are 8 m, 5 m and 3 m respectively.
Area of four walls of the room is: 2h(l+b)
A=2h(l+b)=2×3(8+5)=6×13=78 m
Area of the ceiling is:
A=l×b=8×5=40 m
Total area of the four walls and the ceiling of the room is 78+40=118 m
It is given that cost of white washing is Rs.15/m
therefore,
Total cost of white washing is:
118×15=1770
Hence, the cost of white washing the walls is Rs.1770.
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