Question

The length breadth and height of a room are 5m 4m and 3m respectively.Find the cost of white washing the walls of the room and ceiling at the rate of rs. 7.50 per m².​

Answer 1

Answer:

four wall area +one wall

2h(l+b)+l×b

2×3(5+4)+5×4

= 74m^2

1m= 7.50 rs

74= 74×7.50

= 555 rupees

Answer 2

Answer:

Given,

Length = 5m

Breadth = 4m

Height = 3m

Area of wall = 2( l + b )h

= 2 ( 5 + 4)3

= 2(9)3

= 2(27)

= 54m²

Area of ceiling = l × b

= 5 × 4

= 20 m

Total area = 20 + 54 => 74

Therefore,

The cost of 20m ceiling at RS. 7.50=

=> 74 × 7.50

=>. RS. 555

Hope its helps （＾ｖ＾）