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Medium Puzzles


Difficulty: MediumPuzzle 21

Can you fill the thermometers with mercury, such that the numbers outside the grid indicate how many cells in each row and column contain mercury.

Mercury always starts filling from the bottom of a thermometer and not every thermometer has to contain mercury.

Puzzle Image

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[Ref: ZVFT] © Johan de Ruiter
Visit www.puzzlepicnic.com for more Thermometer Puzzles.
 


Difficulty: MediumPuzzle 22

Puzzle IconThe other day I was sitting in my local tavern, The Spyglass, which overlooks the sea, when in sailed my old friend the pirate Captain Conan Drum. "Well, shiver me barnacles!" he roared on seeing me. He too is a bit of a puzzle addict and so, after joining me for a glass of milk and telling me about his latest exploits on the high seas, he couldn't resist showing me his latest conundrum.

He reached into one of his jacket pockets and produced seven gleaming £5 coins, which he then proceeded to arrange on the table in front of me exactly as shown below. "Now, me lad." he said, with a mischievous look in his eyes. "I'll wager you'll not be able to solve this one. Take away two coins from this here arrangement to leave five coins across and three coins going down."

It was clear the wily old sea dog still had one or two tricks up his sleeve, as I couldn't for the life of me see how it could be done. Can you see through his skulduggery and solve it?

Coins

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[Ref: ZFSL] © Lloyd King.
Lloyd has created an excellent book of lateral puzzles
 


Difficulty: MediumPuzzle 23

The surface area of a spherical balloon measured in square inches is the same as its volume, measured in cubic inches. What is the diameter of the balloon?

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[Ref: ZEZW]  


Difficulty: MediumPuzzle 24

Puzzle IconThree people are buried in the sand all facing forwards with their heads above ground.

Each person has a hat placed on their head selected from a bag containing 3 red hats, and 2 black hats, and they knew the possible hat choices.

They cannot turn around to see those behind them.

The person at the back is asked what hat they are wearing. They reply 'I do not know'. The middle person is asked what hat they are wearing. They also reply 'I do not know'. The person at the front is then asked what hat they are wearing. They reply 'I am wearing a red hat'.

How did they know?

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[Ref: ZSAU]  

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