problem archive
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A snail is at the bottom of a 30-foot well... -
You have two ropes. Each rope takes exactly 1 hour to burn... -
I am an odd number. Take away one letter and I become even... -
You are in a dark room with a box of matches, a candle, a wood stove... -
You have 12 identical-looking coins, but one is either heavier or lighter... -
There are 100 doors in a row, all initially closed... -
A person has a 5-gallon jug and a 9-gallon jug... -
A prisoner is told, 'If you tell a lie, you will be hanged...