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10 Digit number puzzle of John Conway with solution


Find the 10 unique digit number having the special property that the number formed by digits from left to right up to the place for each of the 10 places is divisible by the place number—is a beautiful puzzle presented by John Conway. It is a large and complex puzzle but can be solved using only the basic concepts taught in middle schools…

King queen and washerman river crossing puzzle


Three couples—king and queen, and minister and washerman with their wives have to cross a river in a boat that can carry at most 2 passengers at a time. The husbands are jealous and without her husband, no lady can be left on any side of the river with other male(s). To make matters worse, the washerman or washerwoman can travel together but not with anyone of the other two couples. Each of the six can row the boat...

3 monkeys and 3 humans crossing river puzzle


This time Three humans, one big monkey and two small monkeys are to cross a river in a boat that can carry at most two, only the humans and the big monkey can row the boat and most alarmingly—at all times number of monkeys must not become more than the number of humans on any bank of the river, Or else the humans will be eaten by the monkeys!....


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