





Use this image to answer the question:

On Wednesdays, Mellissa packs only two notebooks and a binder into her backpack. How much does her full backpack weigh on Wednesdays?
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On Thursdays, Mellissa puts her laptop, supply case, two textbooks, and a notebook in her backpack. How much does her full backpack weigh on Thursdays?
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How much more does the backpack weigh with 3 textbooks and a notebook than it does with just 1 textbook and the supply case?