A Burgertastic Problem

Topic: Problem Solving (Misc.)
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How can two kids find out the most amount of burgers they can buy with $48? Due to the complicated deals, this problem becomes much harder for the kids. How will they figure it out in the end, and will they make the right decision?

Common Core Standards: SMP
Problem #: 
6 (2014-2015)
Problem Difficulty Level: 3 [?]