Question

A room, 15 m long, 4 m high and 5 m wide has three doors 3 m by 2.5 m and three windows 2 m by 0.75 m. If the
cost of colouring the walls and the ceiling is `20 per sq. m, then find the total cost of polishing the walls and
ceiling.


please answer fast please please

Answer 1

Answer:

5660

Step-by-step explanation:

total surface area=2(l×b+b×h+l×h)

total surface area=2(15×5+5×4+15×4)

total surface area=2(75+20+60)=310

but here we are not painting bottom face of room so subtract it

area=total surface area-(15×5)=310-75=235

total area consumed by doors=3(3×2.5)=22.5

total area consumed by the window=3(2×0.75)=4.5

final area to paint=310-(22.5+4.5)=283

cost=20×283=5660