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Difficulty: MediumPuzzle 17

Which square, which circle, and which triangle has the closest area to the doughnut shape on the left?

The drawings are to scale, so you might be able to judge it, as well as working the actual areas out.

Puzzle Image

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[Ref: ZKRC] © Kevin Stone 



Difficulty: MediumPuzzle 18

Can you create a sentence that contains the word 'and' five times in a row?

Note: with no other word between each 'and'.

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[Ref: ZDBT]  



Difficulty: MediumPuzzle 19

BrainAdrian, Betty, Ceiren and Darren are all trapped on an island in the middle of a crocodile infested lake.

Luckily they have one crocodile repelling stick that just about protects up to two swimmers.

To get to safety a maximum of two swimmers can be in the water at any one time and they have to be together to benefit from the stick, and must swim at the pace of the slower swimmer.

The shore is 50 metres away and they can not throw the stick back, someone has to swim back with the stick until all four are safely on the shore.

   Adrian can swim the distance in 3  minutes
   Betty  can swim the distance in 7  minutes
   Ceiren can swim the distance in 13 minutes
   Darren can swim the distance in 17 minutes

How long does the overall rescue take - the answer is not 43 minutes!

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[Ref: ZFKO]  



Difficulty: EasyPuzzle 20

What is represented by this BrainBat?

 E E
  Y
 E E
D   D

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[Ref: ZVEQ] Copyrighted. 


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