Question: Driving a piling into a harbor bottom, a pile driver sinks the piling 24 inches on the first stroke, 18 inches on the second stroke,

Driving a piling into a harbor bottom, a pile driver sinks the piling 24 inches on the first stroke, 18 inches on the second stroke, and 13(1)/(2) inches on the third stroke. If the sequence is continued, how far will the piling be driven down on the 5th stroke?

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