She gives the busboy a $5 refund, but he can’t figure out how to evenly divide five dollars three ways. The customers don’t even know they’ve been overcharged, so he just takes a $2 tip for himself and hands the three customers one dollar each.
If the customers only paid $9 each for lunch and the busboy pocketed $2, where is the missing dollar?!?
Walkingame’s Tutor’s Assistant: https://archive.org/details/walkingamesarit00walkgoog/page/n174
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