It could be 68.191, if the rule is to divide each term by 1.0999 to get the next one.
It could be 68.5, if the rule is to subtract 6.5 from each term to get the next one.
If you gave us one more number in the sequence, we could tell.
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15. It's a Geometric Progression with a Common Ratio of 1/5 (or 0.2).
31 Because, twice 31 is 62. And, 62 plus 13 is 75.
75% to 62% is a decrease of 17.3333%
75 minus 13 equals 62.
62/75 is in its simplest form