2018 · Q84
Walls (excluding their roofs and floors) of 5 identical rooms having length, breadth and height 6 m, 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?
Elementary MathematicsMensuration
- A10
- B12
- C13
- D14
Explanation
Wall area per room = 2(6 + 4) × 2.5 = 50 m²; five rooms give 250 m². At 20 m² per litre, 12.5 litres are needed, i.e. 13 one-litre cans, option (C).