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Difficulty: MediumPuzzle 333

?Mr Smith has lots of pound coins, ten boxes in all. Each box contains 100 pound coins, but one box contains coins which are all counterfeit and are slightly lighter, 1/16 of an ounce lighter to be exact.

The problem lies in the fact that they all look identical, the only way to tell them apart is to weigh them.

Mr Smith knows the correct weight for a box, but how many weighings are required to determine which box contains the counterfeit ones?

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[Ref: ZJYH]  



Difficulty: MediumPuzzle 334

What number comes next in this sequence:

12 13 15 17 111 113 117 119 123 ==?==

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[Ref: ZBLZ] © Kevin Stone 



Difficulty: MediumPuzzle 335

You have the misfortune to own an unreliable clock. This one gains exactly 12 minutes every hour.

It is now showing 10pm and you know that is was correct at midnight, when you set it.

The clock stopped four hours ago, what is the correct time now?

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[Ref: ZZXT] © Kevin Stone 



Difficulty: EasyPuzzle 336

What is represented by this BrainBat?

erutuf eht ot

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[Ref: ZQXE] Copyrighted. 


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