If an engine turns at 4500 RPM at 60 percent power, what is its maximum RPM?

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Multiple Choice

If an engine turns at 4500 RPM at 60 percent power, what is its maximum RPM?

Explanation:
RPM at a given power setting scales with the maximum RPM. If 4500 RPM is 60% of the maximum, you can find the max by dividing by 0.60: 4500 ÷ 0.60 = 7500. So the maximum RPM is 7500. This makes sense because 60% of 7500 is exactly 4500. The other values wouldn’t yield 4500 at 60% (e.g., 60% of 7000 is 4200, 60% of 8000 is 4800, etc.).

RPM at a given power setting scales with the maximum RPM. If 4500 RPM is 60% of the maximum, you can find the max by dividing by 0.60: 4500 ÷ 0.60 = 7500. So the maximum RPM is 7500. This makes sense because 60% of 7500 is exactly 4500. The other values wouldn’t yield 4500 at 60% (e.g., 60% of 7000 is 4200, 60% of 8000 is 4800, etc.).

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