Praxis 5511 Practice Test Practice Question
Premixed concrete is sold in 80-pound bags, and each bag provides approximately 0.6 cubic foot of concrete. Which of the following is the best estimate of the number of 80-pound bags of premixed concrete needed to fill a rectangular foundation 6 feet wide by 10 feet long by 1 foot deep?
Correct Answer: B
Rationale: To determine the number of 80-pound bags of premixed concrete needed, first calculate the volume of the foundation: \(6 \, \text{ft} \times 10 \, \text{ft} \times 1 \, \text{ft} = 60 \, \text{cubic feet}\). Each 80-pound bag provides approximately 0.6 cubic feet of concrete. Dividing the total volume by the volume per bag gives \(60 \div 0.6 = 100\) bags.
Option A (136) overestimates the requirement due to incorrect volume calculations. Option C (50) underestimates by not accounting for the full volume needed. Option D (36) significantly underestimates, missing the necessary volume altogether. Thus, 100 bags is the best estimate.
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