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 Rupees 7.50 per m2

Answer 1

rs 305 is the costof whitewashing
firstly by 2(bh+hl)+lb
answer is 54
7.50×54
305.00

Answer 2

Answer:-

★ Given:-

→ Length (l) of room = 5m

→ Breadth (b) of room = 4m

→ Height (h) of room = 3m

★ Point to be remembered:-

It can be observed that 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)

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

= Rs. 555