Question
Tim bought the same number of files and pencils. The total cost of 2 files and 1 pencil was $12. The total cost of 1 file and 2 pencils was $9. He spent a total of $21. How many files did Tim buy?
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Tim bought the same number of files and pencils. The total cost of 2 files and 1 pencil was $12. The total cost of 1 file and 2 pencils was $9. He spent a total of $21. How many files did Tim buy?