Math Arguments
Problems, Questions, and Puzzles to spark discussion and argument in the maths classroom.
You Can't Have that Many McNuggets
McNuggets come in boxes of 3, 6, or 20.
You can get 9 by buying a 3-piece and a 6-piece, but you can't get 13.
You can get 21 by buying seven 3-piece boxes, but not 22.
You can get 23 with a 20-piece and a 3-piece, etc.
What is the largest number of McNuggets you CAN'T get with some combination of 3-piece, 6-piece or 20-piece boxes?
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Source:
internet
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