AoPS Wiki talk:Problem of the Day/July 27, 2011
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Problem
AoPSWiki:Problem of the Day/July 27, 2011
Solution
This Problem of the Day needs a solution. If you have a solution for it, please help us out by adding it.
You spent 10 dollars buying the coupon, so you must save 10 dollars on something else. So, 
and 
