Question

a classroom is 7 metre long 6 metre Brad and 4metre height the door and window occupy an area of 7 m^2 find the cost of whitewashing the will and roof at the rate of a rupees 15metre square ​

Answer 1

Answer:

Cost of whitewashing= 2085/-

Step-by-step explanation:

Length (l) = 7m

Breadth(b) = 6m

Height(h) = 4m

Surface area of the room= 2*(lb+bh+lh)

= 2*(7*6+6*4+7*4)m²

= 2*(42+24+28)

= 188m²

Area of the floor= 7m*6m

= 42m²

Area of the walls and ceiling to be painted= =188m²-(42m²+7m²)

= 139m².

Cost of whitewashing= 15* 139

= 2085/-.

Therefore the cost of whitewashing= 2085/-