Elementary Brain Teaser - February 17, 2020

Here are eight pairs of numbers.  Based on the values of the first 7 pairs of numbers, what value should replace X in the 8^th pair?

(111, 34), (96, 29), (87, 26), (72, 21), (69, 20), (51, 14), (48, 13), (27, X)

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