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GATE 2019 CE (CE2) – Question 4

General Aptitude · Quantitative Aptitude: Algebra, Geometry and Mensuration · 1 mark · Multiple choice

A retaining wall 30 m × 12 m × 6 m is constructed with bricks 8 cm × 6 cm × 6 cm. Bricks occupy 60% of the wall volume. Find the number of bricks in lakhs.

  1. 30
  2. 40
  3. 45
  4. 75

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Correct answer: (C) 45

Explanation

Brick volume is $0.60(30)(12)(6)=1296$ m³. Each brick occupies $0.08(0.06)(0.06)=0.000288$ m³. Number is $1296/0.000288=4500000$, or **45 lakhs, C**.