Cleave Books
Puzzle Trio 7

19. I recently found just the things I wanted at a car-boot sale.
The way they were priced was interesting.
5for 10p
12for 18p
14for 20p
19for 24p
I eventually worked out the 'logic' of the prices.
What did 11 cost me?

20. Kim wishes to measure out 4 litres of water, but has only two jugs which, when full, hold 3 litres and 5 litres respectively and have no other markings on them.
Plenty of water is available from a tap.
How can Kim measure out exactly 4 litres?

21. A deltahedron is a 3-dimensional shape all of whose faces are equilateral triangles.
The simplest of these is a regular tetrahedron, which is made of 4 equilateral triangles.
So it has 4 faces, 4 vertices, and 6 edges.
The deltahedron I have has 9 vertices.
How many faces does my deltahedron have?

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