Hard Number Series Puzzle

What number comes next in the series?

5 15 5 18 5 24 14 20 _




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*Hint: Check Puzzle Title

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Is a married person looking at an unmarried person ?

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In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
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------- +
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Jigsaw puzzles

Jigsaw puzzles soared in popularity during the great depression, as they provided a cheap, long-lasting, recyclable form of entertainment.