Question

20. A room is 8.5 m long, 6.5 m broad and 3.4 m high. It has two doors, each measuring
(1.5 m by 1 m) and two windows, each measuring (2 m by 1 m). Find the cost of painting its
four walls at 160 per m2.​

Answer 1

Answer:

Given:

Given the room dimension is 8.5 m by 6.5 m by 3.4 m

There are 2 doors.

Each door is 1.5 m by 1 m.

There are 2 windows.

Each window is 2 m by 1 m.

To Find:

The cost of painting its 4 walls at Rs 160 per m²

Solution:

Find the area of the 4 walls including the doors:

Area of the 4 walls = 2(8.5 + 6.5) x 3.4

Area of the 4 walls = 102 m²

Find the area of the two doors:

1 door = 1.5 x 1

1 door = 1.5 m²

2 doors = 1.5 x 2

2 doors = 3 m²

Find the area of the two windows:

one window = 2 x 1

one window = 2 m²

two windows = 2 x 2

two windows = 4 m²

Find the area of the 4 walls without the doors:

Area = 102 - 3 - 4

Area = 95 m²

Find the cost:

1  m² = Rs 160

95  m² = 95  x 160

95  m² = Rs 15,200

Answer: The cost is Rs 15,200

Step-by-step explanation:

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