Hard Number Series Puzzle

What number comes next in the series?

5 15 5 18 5 24 14 20 _




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Replace the question mark with the correct number below.

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What fraction of the tank (initially empty) will be filled in 0.64 hours if all three pipes are in operation? Give your answer to two decimal places (e.g., 0.25, 0.5, or 0.75).

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I have nine bottles of wine and one of the nine bottles is poisoned.
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It can't be seen, can't be felt, can't be heard, and can't be smelt.
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Look at this sequence from top to bottom. What is the next number in the sequence?
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A maths symbol is hidden in the below Bar Graph. Can you decipher it?

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What is common among 11, 69, and 88?

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In the 1920s, people feared that crossword puzzles would contribute to illiteracy.