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If that aircraft is limited to a \( 90 \) t maximum and its tanks are enlarged to hold \( 30 \) t, the payload it can carry becomes

  • A.25 t
  • B.10 t
  • C.15 t
  • D.20 t

Answer: C

Correct answer: 15 t

With the take-off weight capped, extra fuel can only come out of payload:

\[ 90 - 45 - 30 = 15 \text{ t} \]

The extra 5 t of fuel has cost 5 t of payload, one for one. That exchange is exactly the sloping portion of the payload-range diagram, along which range is bought at the price of revenue load.

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