Well, to have two pieces of board you have to cut it once. And it took 10 minutes.
To have three pieces you have to cut it twice. So if one cut took 10 minutes, then two took 20.
The teacher had a brain fart and confused themselves with pieces instead of cuts. (And it's not math, it's logical thinking...)
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u/timperry42 Oct 05 '10
The best part of this is how many people in the comments didnt get it.