Stolen Root Beer
Braingle.com
on
Published in Brain Teasers
After Bob takes the first four bottles, he arranges the remaining 24 bottles like this:
3 3 3
3 0 3
3 3 3
When he takes the next four and only leaves 20 bottles, he arranges them like this:
4 1 4
1 0 1
4 1 4
Today's brain teaser courtesy of Braingle.com.