Civil Service Exam Reviewer · Measurement and Geometry · hard
The four walls of a room 3 m by 6 m with a 2.5-m ceiling are to be painted. There is a door of 2 m² and windows totaling 2 m². If 1 liter of paint covers 12 m², how many whole liters are needed?
- 5 liters
- 6 liters
- 4 liters
- 3 liters
Answer
C. 4 liters
Solution
Wall area = 2(3 + 6) × 2.5 − 2 − 2 = 41 m². Paint = 41 ÷ 12 = 3.42 → 4 liters.
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