Question
Gabriel bought the same number of notebooks and files. The total cost of 3 notebooks and 1 file was $20. The total cost of 1 notebook and 3 files was $12. He spent a total of $56. How many notebooks did Gabriel buy?
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Gabriel bought the same number of notebooks and files. The total cost of 3 notebooks and 1 file was $20. The total cost of 1 notebook and 3 files was $12. He spent a total of $56. How many notebooks did Gabriel buy?