Question

a room is 8 m long,9m broad and 5.5 m high. it has one door of diamensions 1.5m×2m and three windows each of diamensions 1 m × 1.5 m.find the cost of white washing the walls at ₹4 per sq meter​

Answer 1

Step-by-step explanation:

the surface area of room=2(8+9*9+5.5*5.5+8)

=2(17*14.5*13.5)

=2*3327.75=6655.5m^2

but surface area of door=2(1.5+2)=2×3.5=7m^2

surface area of 1 window=2(1+1.5)=2×2.5=5m^2

surface area of 3 windows =3×5=15m^2

total wall for colour =surface area of room _ (surface area of door+surface area of 3 windows)

=6655.5 -(7+15)

=6655.5-22

=6633.5m^2

cost of white washing wall =4×6633.5=26534rupees

hence the cost of white washing the wall is rs 26534