Discussion
Oil pressure falls from 60 to 15 pounds per square inch. The percentage drop is
Answer: A
Correct answer: 75 per cent
The drop is measured against the original value:
\[ \frac{60 - 15}{60} \times 100 = 75\% \]
The distractor 25 per cent is the remaining fraction rather than the loss, and 300 per cent inverts the ratio. In operational terms a fall of this size is far more than a trend: at 15 psi the oil film supporting the bearings is unlikely to be maintained, so this is an immediate-action indication rather than something to monitor.
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