Question

class room is 6.8 M long 3.5 Wide and 270 cm high find the cost of plastering the walls and ceilings at the rate of rupees 12 per metre square​

Answer 1

From the given information, we can infer that the classroom is a cuboid.

So l=6.8m

    b=3.5m

    h=270cm=2.7m

NOTE: We need to make sure that all the measurements have the same unit.

For 1m², the cost of plastering is Rs.12

Hence for the entire room, it will cost- 12x(Total surface area of the room)

=12(2(6.8x3.5+3.5x2.7+6.8x2.7))

=12(2(23.8+9.45+16.32))

=12(2(49.57))

=12(99.14)

=1189.68

Hence the plastering of the class room will cost Rs.1189.68.

Thank you and have a great day!