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Difficulty: EasyPuzzle 333

The month of March in the year 1980 contained 5 Saturdays and 5 Mondays.

What day of the week was the 15th of March?

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[Ref: ZVNZ] © Kevin Stone 



Difficulty: EasyPuzzle 334

What is represented by this BrainBat?

TUNE TUNE TUNE TUNE

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[Ref: ZVZY] © Kevin Stone 



Difficulty: MediumPuzzle 335

?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 336

What number comes next in this sequence:

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

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[Ref: ZBLZ] © Kevin Stone 


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