Carpenter Red Seal Exam Prep · Question
A carpenter is estimating materials for a 10 m x 12 m concrete slab that is 150 mm thick. If concrete is ordered in cubic meters, how many cubic meters of concrete are required, accounting for 5% waste?
First, calculate the volume of the slab: 10 m x 12 m x 0.150 m = 18.0 m³. Then, add 5% for waste: 18.0 m³ x 1.05 = 18.9 m³. Options A and C do not account for t
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Question: A carpenter is estimating materials for a 10 m x 12 m concrete slab that is 150 mm thick. If concrete is ordered in cubic meters, how many cubic meters of concrete are required, accounting for 5% waste?
Answer options:
- 18.0 m³ ✅ 18.9 m³
- 20.0 m³
- 20.5 m³
Correct answer: 18.9 m³
Explanation: First, calculate the volume of the slab: 10 m x 12 m x 0.150 m = 18.0 m³. Then, add 5% for waste: 18.0 m³ x 1.05 = 18.9 m³. Options A and C do not account for the correct volume or waste.
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