Question

The length, breadth and height of room are 5m,4m

and 3m respectively. Find the total cost of whitewashing the ceiling at the rate of Rs.12 per 2

and

four walls at rate of Rs.10 per2

.​

Answer 1

Step-by-step explanation:

Here,

L=5m

B=4m

H=3m

Now, total surface area of four walls = 2(l+b)h

=2(5+4)3

= 2×9×3

=54 m sq.

cost of white washing = rupees 10 per 2 msq

so cost for 1 m = 5 rupees

therefore cost for white washing four walls = 54×5=270 rupees

area of ceiling= lb

= 5×4= 20 m sq

cost for white washing ceiling = 12 per 2 m

so cost for 1 m = 6 rupees

therefore cost for ceiling = 6×20=120 rupees

Answer 2

Answer:

cost of white washing only ceiling= Rs.120

cost of white washing four walls at the rate Rs.10 per 2m=Rs.400

Step-by-step explanation:

area of the ceiling can be found by l×b= 5×4=20m

cost= Rs.12/2 ×20=Rs.120

area of the four walls= 20+20+20+20=80m

cost=Rs.10/2 ×80=Rs.400

Hope that was helpful,

I'm very sorry if the answer is wrong.