Question

A rectangular class room measuring 4.8 m by 3.2 m has a height 2.8 m. The walls of the class room are to be painted. Find the cost of painting the walls at Rs. 32 per square metre.

Answer 1

Answer:

Rs 1433.6

Step-by-step explanation:

We are supposed to paint all the walls(4 walls), we can apply:

Area of four walls = 2(l + b)*h

∴ Area to be paint = 2(4.8 + 3.2)*2.8

                         = 2(8)*2.8

                         =  44.8 m²

Cost of painting = rate x area

                      = Rs 32 x 44.8

                      = Rs 1433.6

Answer 2

Question:-

• A rectangular class room measuring 4.8 m by 3.2 m has a height 2.8 m. The walls of the class room are to be painted. Find the cost of painting the walls at Rs. 32 per square metre.

To Find:-

• Find the cost of painting the walls at ₹32.

Solution:-

Here ,

• $\sf Area \: of \: walls = 2( l + b )h$

Now ,

We have to find the area to be painted:-

$\longrightarrow\sf \: Area = 2( 4.8 + 3.2 )2.8$

$\longrightarrow\sf \: Area = 2 \times 8 \times 2.8$

$\longrightarrow\sf \: Area = 44.8 \: { m }^{ 2 }$

We have to find the cost of painting:-

$\longrightarrow\sf \: Cost = Prize \times Area$

$\longrightarrow\sf \: 32 \times 44.8$

$\longrightarrow\sf \: 1433.5$

Hence ,

• Cost of painting is ₹ 14433.5