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Discrete Reasoning Puzzles - Solution for #7

Solution for #7

Alternate Solution #1

Ninety nine -- if they're all pennies.

Alternate Solution #2

Actually, you can have any number. At one time, a U.S. $10 gold coin called the Eagle was minted, and you could have any number of these without having change for a dollar. It is no longer minted, but it's still legal tender.