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The volume is that of a cylinder:

radius = ½ × diameter

volume = π × redius² × height = π × (½ × 3)² × 5 ft³ = 11¼π ft³ ≈ 35.343 ft³

What this is in gallons depends upon the gallon used:

1 ft³ ≈ 6.229 imp gal → 35.343 ft³ ≈ 35.343 × 6.229 imp gal ≈ 220.15 imp gal

1 ft³ ≈ 7.481 US gal → 35.343 ft³ ≈ 35.343 × 7.481 US gal ≈ 264.38 US gal

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Q: How many gallons in a round fuel tank 5 feet long and 3 feet diameter?
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