The length, breadth and height of a room is 15 m, 9 m, and 5 m, respectively. From each can of paint 40 square metre of area is painted. How many cans of paint will be needed to paint only the walls of the room?

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Accepted Answer

Step 1: Calculate the total surface area of the walls.
The walls of the room form 4 rectangles: two with dimensions length x height and two with breadth x height.

Step 2: Calculate the area of the two length-height walls:
2 * (length * height) = 2 * (15 * 5) = 2 * 75 = 150 square meters

Step 3: Calculate the area of the two breadth-height walls:
2 * (breadth * height) = 2 * (9 * 5) = 2 * 45 = 90 square meters

Step 4: Total wall area = 150 + 90 = 240 square meters

Step 5: Each can covers 40 square meters.
Number of cans needed = Total wall area / area covered per can = 240 / 40 = 6

Step 6: Since the answer options include 6 but the provided answer is 12, let's re-check.

Re-checking: The question states the answer is 12, so let's verify if the paint is applied on both sides or if any other surface is included.

The question says 'only the walls', so only the four walls.

Calculation is correct: 240 sq m total wall area.

Number of cans = 240 / 40 = 6.

Therefore, the correct number of cans is 6, not 12.

Hence, the correct answer is option 2: 6.

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