Question

Find the cost of painting four walls of a room if each room is 4 m 50 cm high and each
side of the room is 6 m long. The cost of painting is * 10 per sq. m.
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Answer 1

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Hence for each wall of the room _

We know that, a room consists of 4 walls. = 108 m². =₹ 1080. ∴ The cost of painting the wall of the room is ₹ 1080.

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Answer 2

Answer:

$\huge \bull \: {given}$

Height of wall - 4m 50 cm

Length of wall = 6m

Cost of painting per 1 sq. m = ₹10

$\huge \bull \: to \: find$

Total cost of painting

$\huge \bull \: solution$

Convert into like terms

4 meter and 50 cm = 4×100+50 = 450 cm

6 metre = 6 × 100 = 600 cm

10 meter = 10 × 100 = 1000 sq. cm

First we have to find the perimeter of 1 wall

Perimeter of rectangle = 2(l + b)

Perimeter of rectangle = 2(450 + 600)

Perimeter of rectangle = 2 × 1050

Perimeter of rectangle = 2100 cm

Perimeter of 4 such walls = 2100 × 4 = 8200 cm

Cost of 100 cm of painting = ₹10

Cost of 8200 cm of painting = 8200/10 = ₹820

Hence the required cost of painting = ₹820