John the distribution manager for a leading mobile phone company has a dilemma. The warehouse has 10 unlabelled rows of pallets, each row contains thousands of phones destined for different countries. Each 100g mobile phone is exactly the same except for those in the row destined for Japan, which have a “special” 2g chip encased within the phone to make sure they work on the Japanese networks.
All the trucks are waiting outside ready to go their separate ways, how can John make sure the right phones go to Japan in the quickest time possible? All John has at his disposal is a digital balance.