A concrete footing requires 45 cubic yards of concrete. The concrete truck delivers in increments of 10 cubic yards. How many truck loads will be needed?
Correct Answer
B) 5 loads
45 cubic yards divided by 10 cubic yards per load equals 4.5 loads. Since you cannot order a partial load, you must round up to 5 complete loads to meet the requirement.
Why This Is the Correct Answer
When calculating concrete truck loads, you must determine how many complete loads are needed to meet or exceed the required amount. Dividing 45 cubic yards by 10 cubic yards per load gives 4.5 loads. Since concrete trucks cannot deliver partial loads, you must round up to the next whole number, which is 5 loads. This ensures you have sufficient concrete to complete the footing.
Why the Other Options Are Wrong
Option A: 4 loads
4 loads would only provide 40 cubic yards (4 × 10), which is 5 cubic yards short of the 45 cubic yards required for the footing.
Option C: 6 loads
6 loads would provide 60 cubic yards, which is 15 cubic yards more than needed, resulting in unnecessary waste and cost.
Option D: 7 loads
7 loads would provide 70 cubic yards, which is 25 cubic yards more than needed, resulting in significant waste and cost overrun.
Memory Technique
Remember 'Round UP for truck loads' - you can't get half a truck, and running short on concrete during a pour is a costly mistake that stops the entire operation.
Reference Hint
ACI 318 Building Code Requirements for Structural Concrete - Chapter on concrete placement and delivery requirements
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