An engine develops 108 horsepower at 87 percent power. What horsepower would be developed at 65 percent power?

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Multiple Choice

An engine develops 108 horsepower at 87 percent power. What horsepower would be developed at 65 percent power?

Explanation:
Power output scales with the percent of power used, so you can find the horsepower at a different percent by multiplying the known horsepower by the ratio of the new percent to the old percent. Compute 108 × (65/87) ≈ 80.7, which rounds to about 81 horsepower. The other numbers don’t fit this proportional change: 93 hp would imply about 86% power, 72 hp about 66% power, and 60 hp about 55% power. So the best match is 81 hp.

Power output scales with the percent of power used, so you can find the horsepower at a different percent by multiplying the known horsepower by the ratio of the new percent to the old percent. Compute 108 × (65/87) ≈ 80.7, which rounds to about 81 horsepower. The other numbers don’t fit this proportional change: 93 hp would imply about 86% power, 72 hp about 66% power, and 60 hp about 55% power. So the best match is 81 hp.

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