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Donuts

Imagine going to a donut shop that sells donuts in packs of 5 or 9. The box of nine is shown, and the box of five is four with one in the middle.




You could order 14 by ordering 1 pack of each. If you needed 20, you could order 4 packs of 5.

You could not order 11, or 12.

What is the largest number you could NOT order?


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Number Theory
David Martin
MS Math

Source: David Martin
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