Question

A room is 6m long, 4 m broad and 3 m high.
find the area of the four walls . Also find the
cost of white washing the four walls at the rate
of 2.5 per m²

(Step by Step)​

Answer 1

Cost = Rs 150

Step-by-step explanation:

Given:

• Length of room is 6 m.
• Breadth of room is 4 m.
• Height of room is 3 m.
• Cost of white washing is Rs 2.5 /m².

To Find:

• What will be the total cost of white washing the room ?

Solution: First of all we have to find the area of room. As we know that

Area of 4 walls of a room = [2(l + b) × h)]

Here we have

• l = 6 m
• b = 4 m
• h = 3 m

$\implies{\rm }$ [2(6 + 4) × 3)]

$\implies{\rm }$ 2(10) × 3

$\implies{\rm }$ 20 × 3

$\implies{\rm }$ 60 m²

So the area of room is 60 m².

Cost of white washing for 1 m² = Rs 2.5

∴ Cost of white washing for 60 m²

= 60 × 2.5

= Rs 150

Hence, cost of white washing will be Rs 150.

Answer 2

Answer:

Step-by-step explanation:

a=6m,b=4 and c=3 m

area of 4 walls=2*c(a+b)

=2*3(6+4)=60 m²

White washing charge

=60*2.5=150