Question

The length, breadth and height of a room are 5 m, 4 m and 3 m respectively. Find the cost
of white washing the walls of the room and the ceiling at the rate of Rs. 7.50 m2.

Answer 1

Total area to be washed = `lb+2 (l+b)h`

Where length `(l)=5m`

Breath (b)= 4m

Height (h)=3m

`∴("Total area to be white washed") =(5xx4)+2(5+4)xx3`

`=20+54=74m^2`

Now,

Cost of white washing `1m^2 is Rs 7.50`

=Rs.555