It's the friday Puzzle! « Richard Wiseman's Blog
October 23rd, 2010
Ten bags are full of coins. All the coins look the same, but those in one of the bags weight 1 gram less than those in the other nine bags.
You have a scale like the one shown in the picture, but are permitted to make only one weighing. Any number of bags will fit on either side of the scales.
How do you find out which bag contains the lighter coins?
UPDATE: There are more than ten coins in each bag, the bags can be opened and the pointer on the scale allows you to see the degree to which it is tipping in a certain direction.
As ever, please do NOT post your answers, but feel free to say if you have solved it and how long it took.
This entry was posted on September 3, 2010 at 5:30 am and is filed under Quirky stuff