11 Nov
2017
11 Nov
'17
9:21 a.m.
There's a classic one that's somewhat a counting issue: A doctor gives a patient 4 pills at noon, and the patient must take one every half hour - at what time does he run out/take the last pill?
I'm especially interested in puzzles that lend themselves to solvers committing fencepost errors, and off-by-one errors more generally.
Jim Propp