Dems, Bems, and Confusion

Team: 
Kool Klems
Topic: Measurement
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On the planet Klem, a pair of scientists have been grocery shopping, however, they are met by an unexpected challenge when they try to pay.

Common Core Standards: 6.RP.3
Problem #: 
3 (2018-2019)
Problem Difficulty Level: 4 [?]