Question

Length of a classroom is twice its height and its breadth is 1.5 times its height. The cost of white
washing the walls at the rate of 21.60 per m? is 2179.20. Find the cost of tiling the floor at the rate
of 26.75 per m?

Answer 1

Answer: Rs. 324

Step-by-step explanation:

Let height of the room be 'h' m.

∴ length of the room=2hm

breadth of the room=  

2

3

​

hm.

area of 4 walls=  

1.60

179.20

​

=112m  

2

 

2(l+b)×h=112

2(2h+  

2

3

​

h)×h=112

2×  

2

7

​

×h  

2

=112

h  

2

=  

14

112×2

​

=16

h=  

16

​

=4m

length=4×2=8m, breadth=  

2

3

​

×4=6m

for, tiling the floor area=l×b=8×6=48m

cost of tiling=48×6.75=Rs.324