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Fuel used reads 4200 kg and fuel on board at departure was 11000 kg. Fuel remaining is

  • A.6200 kg
  • B.6800 kg
  • C.15200 kg
  • D.7800 kg

Answer: B

Correct answer: 6800 kg

Fuel remaining is what was loaded less what has been used:

\[ 11\,000 - 4200 = 6800\ \mathrm{kg} \]

In practice the figure is cross-checked rather than taken alone: fuel used is derived by integrating flow, while contents gauges measure what is in the tanks, and the two are compared. A growing discrepancy between them is one of the standard indications of a fuel leak, which is why both are displayed and why neither is relied on by itself.

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