Big, Big, Big Book of Brainteasers
Some sample puzzles:
#162: On a standard QWERTY keyboard, find 3 consecutive letters that make an acute triangle.
#181: An 8 slice pizza was eaten by 4 people. No-one ate more than the other 3 combined, and everyone had a different number of slices. How many did each person eat?
#384: A 24-hour clock shows the time 01:23, where the digits are in an increasing arithmetic progression. In this case, they increasing with constant of 1. How many times in 24 hours will this property be seen?
http://www.mathpuzzle.com/
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