A ten feet long steel bar is lifted with a force of 400 pounds. If the force required to lift the steel bar is proportional to its length, what is the length of the longest steel bar that could be lifted by a force of 500 pounds?

(D) 12.5 ft

Explanation

Since 400lbs can lift a 10ft bar, 500lbs will lift 25% more, or a 12.5ft bar.

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