The cost of paint is Rs.36.50 per kg. If one kg of paint covers 16 square feet, how much will it cost to paint outside of a cube having each side of 8 feet?

The cost of paint is Rs.36.50 per kg. If one kg of paint covers 16 square feet, how much will it cost to paint outside of a cube having each side of 8 feet?

  • (A) Rs.850
  • (B) Rs.860
  • (C) Rs.876
  • (D) Rs.886
  • Solution: Let’s solve this problem in a relaxed way.
  • Step 1: Find the surface area of the cube:
  • The cube has 6 faces, and all faces are square with a length of 8 ft.
  • Surface area = 6 x (length of the sides)^2 = 6 ×(8)^2 = 6 × 64 = 384 sq ft.
  • Step 2: Find the paint needed:
  • 1 kg of paint is needed for an area of 16 sq ft.
  • Therefore, paint needed = (Total area) / (Area per kg of paint) = 384/16 = 24 kg.
  • Step 3: Find the cost:
  • Cost = Paint needed x Cost per kg of paint = 24 × 36.50 = (36.50 × 20) + (36.50 × 4) (using the distributive law of multiplication over addition) = 730 + 146 = 876.
  • Answer: Rs. 876 (Option C).
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Related MCQs:

 ‘NATO’ is an abbreviation of:

  • (A) North Atlantic Treaty Organization
  • (B) Non-Aligned Treaty Organization
  • (C) Non-Aligned Trading Organization
  • (D) North American Transport Organization

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