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Walls (excluding their roofs and floors) of 5 identical rooms having length, breadth and height 6m, 4 m and 2.5 m respectively are to be painted. Paints are available only in cans of 1 L and one litre of paint can be used for painting 20 square metres. What is the number of cans required for painting?
  • a)
    10
  • b)
    12
  • c)
    13
  • d)
    14
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Walls (excluding their roofs and floors) of 5 identical rooms having l...
Area to be painted in each room = 2 (lh + bh)
⇒ 2 × (6 × 2.5 + 4 × 2.5) = 50 m2
Total area to be painted = 5 × 50 = 250 m2 [∵ 5 rooms are to be painted]
Amount of paint required in litres = 250/20 = 12.5 litres [∵ 1 L paints 20 m2]
If one can contains 1 L, 13 cans have to be purchased to get 12.5 litres [∵ Fraction is not possible]
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Most Upvoted Answer
Walls (excluding their roofs and floors) of 5 identical rooms having l...

Calculating the total surface area of walls:
- Each room has 4 walls
- Surface area of each wall = 2.5m * 4m = 10 sq.m
- Total surface area of walls in one room = 4 * 10 sq.m = 40 sq.m
- Total surface area of walls in 5 rooms = 5 * 40 sq.m = 200 sq.m

Calculating the number of cans required:
- 1 litre of paint can be used for painting 20 sq.m
- Total number of litres required = Total surface area / Area covered by 1 litre = 200 sq.m / 20 sq.m = 10 litres

Converting litres to cans:
- 1 can contains 1 litre of paint
- Number of cans required = 10 litres / 1 litre = 10 cans

Therefore, the number of cans required for painting the walls of 5 identical rooms is 10 cans. Hence, the correct answer is option (a) 10.
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Walls (excluding their roofs and floors) of 5 identical rooms having length, breadth and height 6m, 4 m and 2.5 m respectively are to be painted. Paints are available only in cans of 1 L and one litre of paint can be used for painting 20 square metres. What is the number of cans required for painting?a)10b)12c)13d)14Correct answer is option 'C'. Can you explain this answer?
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