Question

the cost of carpeting a room which is 5 metre height and length is twice of its carpeting a room which is 5 metre has and length is twice of its breadth is rs 36000 at the rate of rs 500 per metre square what will be the cost of a string its four wall at a rate of rs 200 per metre square​

Answer 1

Answer

Let the length ,breadth and height is l , b and h respectively

Then area of four wall of room =2h(l+b) sq m

If length breath and height is twice. Then length=2l breadth ,=2b and height =2h

Then area of new room wall=2×2h(2l+2b)=8h(l+b) sq m

But cost of plastering the four walls Rs 25

Then cost of plastering the four walls of new room=

2h(l+b)

8h(l+b)×25

=100 Rs