7 Aug 2022 1:22 am
You fell into the same trap, weighing 6x6 does not give you any information. Because remember, you have to figure out if the last marble is heavier or lighter. And you just wasted one of your 3 weighings.Skans » 06 Aug 2022, 12:21 pm » wrote: ↑ Ok, here's my solution:
- Weigh 6 on one side and 6 on the other
- Eliminate the 6 that are the heavier side
- Now, from the lighter 6, place 3 on one side of the scale and 3 on the other side
- Eliminate the 3 that are the heavier.
- Take only two of the marbles from the 3 remaining and place one on each side of the scale
- If the scale balances, then the one you didn't weight is the light one; if one side or the other is out of balance, then the lighter side gives you your answer.