How many bags should I buy?

Team: 
FallOutGirls
Topic: Solid Geometry
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Mom needs to know how much dirt is needed to fill up a raised garden in their back yard. she asks her daughter to calculate how many bags of dirt are needed to fill the garden.

Common Core Standards: 7.G.6
Problem #: 
88 (2014-2015)
Problem Difficulty Level: 4 [?]