01/03/2013 - What Symbol? (*)

This puzzle is rated 1 star (easy).

Description

Write out the numbers seven and eight, with a space between them.

Puzzle
What mathematical symbol can you put between the seven and the eight, to get a number bigger than seven but smaller than eight?

Check the solutions page for the correct answer.

28/02/2013 - Coin Jumping (***)

This puzzle is rated 2 star (hard).

Description

Layout 10 coins in a row.

Coins must jump two places and over exactly two coins each time (either one coin in each of the two spaces it is jumping or over two coins in one place and zero coins in the other place).  This rule has been shown above.

Puzzle
Using the rules given above end with 5 stacks of 2 coins.

Check the solutions page for the correct answer. 

27/02/2013 - Three Cups (*)

This puzzle is rated 1 star (easy).

Description

Three cups are placed on a table, with the outer two facing up and the middle one facing down.

Puzzle

Flipping two cups each move, make three moves to have all the cups facing up.

Check the solutions page for the correct answer.

26/02/2013 - Your ABC (***)

This puzzle is rated 3 star (hard).

Description

A nice bit of algebra this one.

ABCD x E = DCBA

Puzzle
Work out what A, B, C, D and E are for the above equation to work.

Check the Solutions page for the correct answer.

25/02/2013 - Cards (*)

This puzzle is rated 1 star (easy).

Description

This is a classic puzzle.  You need to know there are 4 lots of 13 different types of card in a standard 52 card deck.

Puzzle
In two decks of cards, what is the least amount of cards you must take to be guaranteed at least one four-of-a-kind?

Check the solutions page for the correct answer.