The storage tank with diameter 91 ft and height 27.02 ft has an approximate volume in gallons of which of the following?

• A. 1,100,000 gallons
• B. 1,316,000 gallons
• C. 1,500,000 gallons
• D. 1,750,000 gallons

Answer: (B)

This question tests estimating the volume of a cylindrical storage tank and converting cubic feet to gallons. The tank is a right circular cylinder, so use V = π r^2 h. The diameter is 91 ft, giving a radius of 45.5 ft. r^2 is 45.5^2 = 2070.25 ft^2. Multiply by the height: 2070.25 × 27.02 ≈ 55,938.155. Multiply by π to get the volume in cubic feet: 55,938.155 × 3.14159 ≈ 175,730 ft^3. Convert to gallons with 1 ft^3 ≈ 7.48052 gallons: 175,730 × 7.48052 ≈ 1,314,600 to 1,315,000 gallons. This is closest to about 1.316 million gallons, so the best approximate value is 1,316,000 gallons.