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 ceiling at the rate of Rs 7.50 per m².

Answer 1

Length $(l)$ of room = 5m

Breadth $(b)$ of room = 4m

Height $(h)$ of room = 3m

According to the question  four walls and the ceiling of the room are to be white washed.

Total area to be white washed = Area of walls + Area of ceiling of room

$= 2lh+2bh+lb$

$= [2×5×3+2×4×3+5×4]$

$= (30+24+20)$

$= 74$

Area = 74 m²

Also,

Cost of white wash per m² area = Rs.7.50 (Given in question )

Cost of white washing 74 m² area = Rs. (74×7.50)

= Rs. 555