Colorado Wastewater (WW) Operator D Practice Exam

What is the approximate number of gallons in one cubic foot?

6.0 8.0 5.5 7.48

Correct Answer:

7.48

Explanation:

Understanding how many gallons fit in a cubic foot comes from using the standard US definitions for volume. A cubic foot is 12 inches on each side, so it equals 12 × 12 × 12 = 1728 cubic inches. A US gallon is defined as 231 cubic inches. So the number of gallons in a cubic foot is 1728 ÷ 231, which is about 7.484—roughly 7.48 gallons. The other options aren’t close because they would correspond to using different gallon sizes or rough rounding that doesn’t match the standard US definitions. If you’re comparing to imperial gallons, you’d get a different value (about 6.23), which isn’t what’s asked here.

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