Question

A room is 8.5 m long ,7 m broad and 4 m hight it has one door measuring 1 m and two windows each measuring 0.5 m by 0.5 m . Find the cost of painting its four walls without door and window , if the rate of painting is Rs 2 per square metre

Answer 1

Answer:

L=8.5m,B=7m,H=4m

Step-by-step explanation:

area of 4 wall=2(l+b)h

                      =2(8.5m+7m)4m

                      =2(15.5m)4m

                      =31 x 4

                      =124

Answer 2

Answer:

Paintable area = Litral surface area - One door area + 2 windows area

2(l+b)×h - (1×1+2×0.5×0.5)

2(8.5+7)×4-(1+0.5)

2×15.5×4-1.5

31×4-1.5

124-1.5

122.5

hence, total cost of painting

122.5×2

245 rs. answer