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To determine the correct expression, we need to calculate the number of truckloads required by converting the volume of Joe’s pool from cubic feet to truckloads.

1. **Pool Volume**: \( 3240 \, \text{ft}^3 \)
2. **Conversion Factor (Cubic Feet to Gallons)**: \( 1 \, \text{ft}^3 = 7.5 \, \text{gal} \)
3. **Truckload Capacity**: \( 1 \, \text{truck load} = 6000 \, \text{gal} \)

The correct calculation sequence would be:
\[
\frac{3240 \, \text{ft}^3}{1 \, \text{pool}} \times \frac{7.5 \, \text{gal}}{1 \, \text{ft}^3} \times \frac{1 \, \text{truck load}}{6000 \, \text{gal}}
\]
This sequence will cancel out all units except for "truck loads."

**Answer**: Option (4) is correct.

Do you need further clarification or have any questions?

Here are 5 related questions for practice:
1. How many gallons are in 500 cubic feet?
2. If a truck can hold 5000 gallons, how many truckloads would Joe need?
3. What is the total volume in cubic feet if two pools each hold 3240 cubic feet?
4. How many cubic feet are in 100 gallons of water?
5. How many truckloads are needed to transport 8000 gallons?

**Tip**: Always ensure units cancel out correctly when using conversion factors.

Which expression would allow Joe to correctly calculate the number of truckloads of water he needs to fill his pool?

Learn how to determine the number of truckloads needed to fill a pool by converting volume from cubic feet to gallons. This problem covers unit conversion, multiplication of fractions, and volume measurement, suitable for students in Grades 9-10.

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