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Medium Puzzles


Difficulty: MediumPuzzle 33

Puzzle IconA large fresh water reservoir has two types of drainage system: small pipes and large pipes.

6 large pipes, on their own, can drain the reservoir in 12 hours.

3 large pipes and 9 small pipes, at the same time, can drain the reservoir in 8 hours.

How long will 5 small pipes, on their own, take to drain the reservoir?

[Ref: ZHRT] © Kevin Stone

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Difficulty: MediumPuzzle 34

Puzzle IconBelow, 10 nine letter words have been broken into chunks of three letters.

These chunks have been mixed up, no chunk is used twice and all chunks are used.

Can you determine what the 10 words are?

cer ent ead rat uti spr
ful oun pro ann ope ock
nce een oat est liv ion
nou sev ion ast hou akf
bre bea ens dim bed seb

[Ref: ZSQP] © Kevin Stone

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Difficulty: MediumPuzzle 35

Can you identify this common sequence:

Puzzle Image

[Ref: ZGNX] © Kevin Stone

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Difficulty: MediumPuzzle 36

Puzzle Icon

Greenjack Round #3

You find yourself playing a game with your friend.

It is played with a deck of only 16 cards, divided into 4 suits:

   Red, Blue, Orange and Green.

There are four cards in each suit:

   Ace, King, Queen and Jack.

Ace outranks King, which outranks Queen, which outranks Jack - except for the Green Jack, which outranks every other card.

If two cards have the same face value, then Red outranks Blue, which outranks Orange, which outranks Green, again except for the Green Jack, which outranks everything.

Here's how the game is played: you are dealt one card face up, and your friend is dealt one card face down. Your friend then makes some true statements, and you have to work out who has the higher card, you or your friend. It's that simple!

Round 3:
You are dealt the Red Queen and your friend makes three statements:

1. My card could lose to a Blue card.
2. Knowing this, if I am more likely to have an Ace or a King than a Queen or a Jack, then I have an Orange card. Otherwise, I don't.
3. Given all of the information you now know, if I am more likely to have a Jack than an Ace, then I actually have a King. Otherwise, I don't.

Who has the higher card, you or your friend?

[Ref: ZGDD] © E.J. Shamblen

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