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
7.50 per m​

Answer 1

Answer:

volume of cuboid=l×b×h

=5×4×3

=60m³

==============60×7.50

================45000

Answer 2

length=5m

breadth =4m

height=3m

curved surface area of room =2(l+b)h

=2×(5+4)×3

=2×9×3

=54 square cm

area of ceiling=l×b

=5×4=20 square cm

cost of white washing of 4walls and ceiling=area of ceiling + CSA of walls×

=54+20=74×7.50

=$555