Question

the length, breath and height of a room are 5m, 4m, 3m, respectively. find the cost of white washing the wall of the room and ceiling at the rate of Rs 8. 50 per m²​

Answer 1

Answer:

Total Surface Area to be white washed

=LTA+ Area of the base

=2(l+b)h+lb=2(5+4)×3+5×4m

2

=74m

2

Cost of white washing =Rs.(74×8.50)=Rs.629

Answer 2

we know this room is in the form of cuboid

so we have to find total surface area of cubooid-area of floor

= 2lb+2bh+2lh-bh

= 2bh+2lh+lb

=2×4×3+2×5×3+5×4

= 24+30+20

= 24+50

= 74 sq.m

cost of white washing = 8.50 × 74 = 629 Rs