Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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What is the capacity in gallons of a rectangular gravity feed tank that measures 27" high, 30" long, and 28" wide?

86.4 gallons
92.5 gallons
98.4 gallons
100.0 gallons

The correct answer is: 98.4 gallons

To determine the capacity of a rectangular tank in gallons, the first step is to find the volume of the tank in cubic inches. The formula for the volume of a rectangular prism is length × width × height. In this case, you would multiply 30 inches (length) by 28 inches (width) by 27 inches (height): Volume = 30 in × 28 in × 27 in = 22,680 cubic inches. Next, to convert cubic inches to gallons, the conversion factor is used: there are 231 cubic inches in a gallon. To find the capacity in gallons, divide the total volume in cubic inches by 231: Capacity in gallons = 22,680 cubic inches ÷ 231 ≈ 98.4 gallons. Thus, the answer is 98.4 gallons, confirming that option C is the correct choice. This correct conversion process accurately transforms the volume measured in cubic inches into gallons, providing the answer needed for practical applications such as determining tank capacity for various uses.