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You have just finished planning a flight and you require 3643 lb of fuel. The fuel tanker supplies fuel in US gallon with the specific gravity of 0.84. How many US gallons do you require?
  • A
    520
  • B
    367
  • C
    437
  • D
    1146
We first must convert 3643 lb into kg, kilograms into litres using the Specific Gravity given, thereafter, Litres (L) into US gallons (USG):
(1) Pounds (lb) to Kilograms (kg) => lb × 0.454
  • 3643 lb x 0.454 = 1653.9 kg
(2) Conversion between Fuel volume and mass: Fuel Mass in kg / Specific Gravity (density) = Fuel Volume in L
  • 1653.9 kg / 0.84 = 1969 l
(3) Litres (l) to US Gallons => Litres / 3.785
  • 1969 l / 3.785 = 520 USG

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