Question

the Length breadth and height of a room are 6 metre 4 metre and 3 M respectively find the cost of whitewashing the for walls of the room @ 12 rupees per metre square the room has an entrance door measuring 2.5 M and 1 m which is not to be white walls

Answer 1

The total area includes (6*5+6*3+5*3)*2 = 126 m^2

Subtract the window, door, and floor which will not be painted

126 - 14 - 30 = 82 m^2 area to be painted

Answer 2

Given:

The length of the room=6m

The breadth of the room=4m

The height of the room=3m

The rate for whitewashing=Rs.12/$m^{2}$

To find:

The cost of whitewashing the four walls of the room

Solution:

The cost of whitewashing the four walls of the room is Rs.690.

We can find the cost by following the given steps-

We know that to find the cost we need to calculate the area of the four walls and subtract the area of the door.

We are given that the length, breadth, and height of the room are 6m, 4m, and 3m, respectively.

The area of the four walls=2(length+breadth)×height

On putting the values,

=2(6+4)×3

=2×10×3

=60$m^{2}$

The area of the door=Length of the door×breadth of the door

=2.5×1=2.5$m^{2}$

So, the area that is to be whitewashed=Area of four walls-area of the door

=60-2.5

=57.5$m^{2}$

Now, we will multiply the area with the rate to calculate the cost.

The cost of whitewashing=Area to be whitewashed×Rate

=57.5×12

=Rs.690

Therefore, the cost of whitewashing the four walls of the room is Rs.690.