BrainBashers - Random Puzzles

Puzzle 169

What is the minimum number of queens required on a chessboard such that all squares are attacked?

Queen On C3

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Puzzle 170

If Malcolm, Laura, John, Alan, Brenda and Kevin like chocolate...

...and Norman, Steve, Thomas, Zebedee do not...

...does Peter like chocolate?

workings hint answer print

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Puzzle 171

How many squares of any size on this chessboard do not contain a rook?

Rooks On B3, C7, F5

workings hint answer print

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Puzzle 172

Kevin is 5 years old, James is also 5, and Rebecca is 7.

How old is Jacqueline?

workings hint answer print

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