Question

A rectangle block is 9m long, 5m wide and 3m high. Find the cost of colouring its surface area at 50 paise per sq. m.?​

Answer 1

$\Huge\mathtt\pink {Hello\:Mate}$

surface area of block=height*breadth*length

=5*3*9

➡135m^3

cost of colouring the surface area

=135×0.5(50 paise)

➡67.5 rs

So the cost of colouring the surface is 67.5 rs...

$\Huge\mathcal\blue{Hope\:it\:helpss}$

Answer 2

Answer:

• The cost of coloring is ₹107.

Step-by-step explanation:

Given that,

• A rectangular block (cuboid-shaped) of dimension 9m × 3m × 5m.

Here, the block's surface is to be colored at the rate of 50paise per m². So, we need to find it's total cost.

Step 1 :

Finding it surface area :

➪ Surface area of the block is given by :

→ 2(lb + bh + lh)

We have,

• l (length) = 9m.
• b (breadth) = 3m.
• h (height) = 5m.

From the given dimensions :

→ Surface area of the block :

→ 2(9*3 + 3*5 + 9*5)

→ 2(27 + 35 + 45)

→ 2(107)

→ 214m²

• The surface area of the block is 214m²

Step 2 :

Finding the total cost of coloring :

➪ Total cost of coloring the block :

→ rate of coloring × surface area of the block.

• Rate is 50 paise or, ₹0.50 per metre² (given)
• Surface area = 214m²

So,

Total cost of coloring = 214 × 0.50

= ₹107

∴ The cost of coloring is ₹107