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Random Puzzles


Difficulty: Medium

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Puzzle 1

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: Medium

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Puzzle 2

My bath has two taps and a plug hole.

The cold tap on its own fills the bath in 12 minutes, the hot one in 8 minutes.

The plug hole can drain the bath in 24 minutes with the taps off.

How long will the bath take to fill if I leave both taps on with the plug left out?

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[Ref: ZWJG] © Kevin Stone 



Difficulty: Medium

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Puzzle 3

Find a number whose double exceeds its half by exactly 99.

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[Ref: ZMUQ]  



Difficulty: Easy

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Puzzle 4

What is represented by this BrainBat?

BBALL ABALL SBALL KBALL EBALL TBALL

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[Ref: ZDOX]  



Difficulty: Medium

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Puzzle 5

What is the next number in this sequence:

1 12 1 1 1 2 1 3 ==?==

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[Ref: ZJIS]  


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