A level setup midway between X and Y reads 6.29 ft on X and 7.91 ft on

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A level setup midway between X and Y reads 6.29 ft on X and 7.91 ft on Y. When moved within a few feet of X, readings of 5.18 ft on X and 6.76 ft on Y are recorded. What is the true elevation difference, and the reading required on Y to adjust the instrument?
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