Question

The length of a room is double its breadth. The cost of colouring the ceiling at Rs. 25 per sq. mis Rs.5,000
and we cost of painting the four walls at Rs. 240 per sq. m is Rs.64,800. Find the height of the room.
(a 4.5 m
(b)4 m
(c)3.5 m
(d)5 m
(e) None of these​

Answer 1

Answer:a

L=2b

Ceiling area = lb

= 2b^2* 25= 5000

B = 10 l = 20

Four walls area = lh +lh+BH+BH

H(2l+2b)

60h* 240= 64800

H= 4.5

Step-by-step explanation:

Answer 2

Answer:

A. 4.5

Step-by-step explanation:

Assume the breadth is x and height is h

So, length is y = 2x

$2x^{2} = 5000/25 = 200$

=> x = 10 , y = 20

Then,

2xh + 2yh = 64800/240 = 270

=> h(x+y) = 135

=> h = 4.5