Question

a room has a length of 8m and breadth of 6m . if the cost of painting its four walls at the rate of 80 per metere rest to 2 is rs. 11200 find the height of the room

Answer 1

Length of room = 8m
Breadth of room = 6m
Let height of room = h
CSA of room = 2(Length+Breadth)Height
                      = 2(8+6)×h
                      = 28h m²
Cost of painting 1 m²  = Rs 80
Cast of painting 28h m² =  80 × 28h
  11200                           = 80 × 28h
   h                                  = 11200/(80 × 28) = 11200 / 2240 = 5m 
So, height of the room is 5m

Answer 2

Answer:

answer =5 m

Step-by-step explanation:

L= 8 m

b= 6 m

let height of room =h

csa of room =2(l+b) h

=2(8+6)×h

28 h m²

cost of painting 1 m² =rs 80

cost of painting 28h m² =80×28h

80×28 h

h=11200 / (80×28)

1120 / 2240

=5 m