Over the years I have seen and created a number of computer tools (e.g. Spreadsheets) for making Electrical Load Calculations, Voltage Drop Calculations and Panel Schedules. None were as nice and useful as these which you will find at http://www.newcalc.com/engineering-software.htm.
IF one had 12 seemingly identical coins, with 11 being of the exact same weight and 1 being either heavier or lighter than the other 11,
THEN using only a balance, not a scale, and with only 3 measurements allowed, how could one determine which of these 12 seemingly identical coins is different and whether it is heavier or lighter than the other 11?
See if you can solve this problem
BEFORE you click here to view the solution