Civil Service Exam Reviewer · Measurement and Geometry · hard
The four walls of a room 3 m by 4 m with a 2.5-m ceiling are to be painted. There is a door of 2 m² and windows totaling 4 m². If 1 liter of paint covers 8 m², how many whole liters are needed?
- 5 liters
- 4 liters
- 6 liters
- 3 liters
Answer
B. 4 liters
Solution
Wall area = 2(3 + 4) × 2.5 − 2 − 4 = 29 m². Paint = 29 ÷ 8 = 3.63 → 4 liters.
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