Question

A rectangular room of length 10m breadth 6m and height 3m. The four walls and the roof have to be painted.if the cost of painting is Rs. 75 per square meter,what is the total cost ? The area of the windows and door is 6 sq.m, which will not be painted.

Answer 1

Length=10m
breadth=6m
height=3m
Area of a wall=2(lb+bh=hl) -lb=216-60=156m²
cost of paint of 1 m²=75Rs
cost of 156  m²=75x156=11700Rs

Answer 2

AREA OF 4 WALLS + ROOF= 2[BH+HL] +LB
AREA = 2[6*3+3*10]+10*6
AREA=2[48]+60
AREA=156 M ^2
AREA EXCLUDING DOORS AND WINDOWS =156-6
                                                                    =150 M ^2
TOTAL COST = 150*75
                      =RS. 11250