Question

2.
it, if a sheet measuring 1m² costs 20.
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
7.50 per m.​

Answer 1

Answer:

given,

length = 5m

breadth= 4m

height = 3m

now ,

lateral surface of room with ceiling= 2h(l+b)+l×b

= 2×3(5+4)+20

= 6×9+20

= 74m^2

cost of white washing per m^2 =₹ 7.50

cost of white washing of 74m^2 = 74×7.50

= ₹ 555

hence the cost of white washing of 74 m^2 is ₹ 555.

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Answer 2

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