Discussion
A wing group weighs \( 9.5 \) t on a \( 90 \) t aircraft. As a fraction of take-off weight this is
Answer: D
Correct answer: 10.6 per cent
\[ \frac{9.5}{90} = 0.1056 \approx 10.6\ \text{per cent.} \] Ten to twelve per cent of take-off weight is the usual range for the wing group of a transport, so the answer is also a sanity check on the estimate. The distractor 9.5 per cent simply repeats the mass in tonnes as a percentage, which is a coincidence of the numbers rather than a calculation.
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