Question

The floor of a rectangular hall has a perimeter 150m if the cost of painting four walls at the rate of 10per meter square is rupees 9000 find the height of the wall

Answer 1

Height - 6m
Solution-perimeter=2(a+b)=150m
So a+b=75
And a=75-b
Now total area of 4 walls =9000/10=900
Let height be c
So 2(ac+bc)=900
ac+bc=450
(75-b)c+bc=450
C=450/75=6m

Answer 2

Answer:

perimeter is equal to 2 a + b is equal to a 150 next line a + b is equal to 75 and a is equal to 7 - 5 total area of four walls is equal to 9000 upon 10 is equal to 900 let the height b h to a + b h is equal to 900 AC + a x + b h is equal to 150 next line (75 minus b) close + b ( (close is equal to 450 is equal to 450 upon 75 S is equal to 26