Question

the floor of a rectangular hall has a perimeter of 300 m,its height is 8m. find the cost of white washing the four floor at the rate of 9 rupees per metre square

Answer 1

h-8 m
-perimeter of rectangular hall- 2(l+b).
..........................................-=300=2(l+8).
..........................................-=300= 2l +16.
..........................................-=300-16=2l.
...........................................-=284=2l.
...........................................-= l =284/2.
...........................................-= l = 142m.