Tag Archives: maths

Units of Measurement

I am generally all for not legislating anything, but the world really does need to use a commonly agreed system for physical measurements. That system is, like it or not, metric. Or rather SI units. I am sure I am not alone in thinking that some mistakes were made in the SI unit system —… Read More »

Weights and Measures

You have a set of balance scales and some weights. You need to be able to measure every whole number weight from 1 to 40 kilograms of (say) flour. What is the smallest number of weights you need and what are their values? The first trick is of course that you can put weights on… Read More »

The Paradox of the Wallets

Bob and Charlie have heard of a game, and must decide whether they will play. They each have a wallet in their pockets, with a random amount of money in it (for our purposes: literally any amount, but more than zero). The game is that they each count the money in their wallets, and whomever… Read More »

Three Gods Puzzle

You are the most eligible bachelor in the kingdom, and as such the King has invited you to his castle so that you may choose one of his three daughters to marry. The eldest princess is honest and always tells the truth. The youngest princess is dishonest and always lies. The middle princess is mischievous… Read More »