Guys, I did not answer your puzzler with $1000 and 10 envelopes because I thought the solution was too easy. But now I realize you do not know it. Yeah, you found your solution with power of two, but that just proves you are geeks from MIT.
OK, have you heard of 200 bills? The Euro has them, and before the Euro many countries had theirs. Here is the REAL-WORLD solution that we have used since elementary school. Six bills: 500, 200, 200, 50, 20, 20; and four coins: 5, 2, 2, 1. Here you go, you can make these into your 10 envelopes. We do this with the cents as well: 50, 20, 20, 5, 2, 2, 1 cents. This is the REAL WORLD outside the USA. We think, dudes! :-)))
Rudy (prof. of Math…)