BrainBashers - Random Puzzles

Puzzle 17

How much soil is there …

… in a circular hole 2 metres deep and 1 metre across?

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Puzzle 18

Using all of the letters A to Z, each once only, complete these common words. There are currently 2 different answers, can you find them both?
-ai-e s-ua- -e-el -o-ed -na-e fog-- c--mp b--jo -r-it -re-t -av-n mu--c mou--

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Puzzle 19

Can you find the encoded countries?

The letter indicates the first letter of the country, and the number represents the number of letters in the country.
H5 V9 D7 J7 F6 N6 P4 Z8 R7 Q5

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Puzzle 20

What comes next in this sequence:

Dave · Edward · Duncan · Neil · Liam · ?
Choose from:

Alan, Kevin, John, Michael, Steve

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