GATE 2023 AR — Architecture – Question 45
Eight classrooms each measure 15 m×10 m×4 m high. Paint the four internal walls, deducting 10% for openings. Base and finish coats require 4.5 and 2.5 litres/m² respectively. Find total paint in litres, as an integer.
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Correct answer: 10080 to 10080
Explanation
Wall area per room is 2(15+10)×4=200 m². Eight rooms give 1600 m²; deduct 10% to obtain 1440 m². The two coat rates sum 7 L/m², so total paint is 1440×7=10080 litres. The unusual rates are litres per square metre as printed, not coverage in square metres per litre.