from barrel #1 remove 10% from barrel #2 remove 20% .... from barrel #9 remove 90% Weigh all 10 barrels at once. The result will be different depending on how much was removed from the 11kg barrel.
Weird. I assumed it was t g e because the beginning of "the end" is t. The middle of "the beginning" is g if you count the space. The end of "the middle" is e.
Not so much a riddle, but a fun puzzle. Basic understanding of what f12 does in a browser is needed. http://hdwhite.org/puzzle/ I am on the second puzzle