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Puzzle 17 


A 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?

Puzzle Copyright © Kevin Stone

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Puzzle 18 


Can you find the country hidden in the following paragraph:

At school, most of my friends learnt French. I learnt Chinese, mainly because I planned to visit the area when I grew up.

Puzzle Copyright © Kevin Stone

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Puzzle 19 


Below, 9 nine-letter words have been broken into chunks of three letters.

The chunks have been moved around, no chunk is used twice, and all of the chunks are used.

Can you determine what the 9 words are?
ome clo ere ref int ere
bar ple pin ise phy gra
hni bio ewh eap sor fes
tec ckw som que tpr pro
nce ter foo

Puzzle Copyright © Kevin Stone

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Puzzle 20 


This BrainBashers safe has a rather unusual control panel.

In order to open the safe, you have to press every single square once only, in the correct sequence, ending on the square marked E.

Each square indicates which square to press next, for example, 2U means move up 2 squares and 3R means move right 3 squares.

Can you determine which square you must start with?

Note: this puzzle is not interactive, and the safe buttons cannot be clicked.

Puzzle Copyright © Kevin Stone

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