Civil Service Exam Reviewer · Measurement and Geometry · hard
The four walls of a room 4 m by 3 m with a 2.5-m ceiling are to be painted. There is a door of 2 m² and windows totaling 1 m². If 1 liter of paint covers 12 m², how many whole liters are needed?
- 4 liters
- 5 liters
- 2 liters
- 3 liters
Answer
D. 3 liters
Solution
Wall area = 2(4 + 3) × 2.5 − 2 − 1 = 32 m². Paint = 32 ÷ 12 = 2.67 → 3 liters.
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