Question
George bought the same number of files and pencils. The total cost of 4 files and 1 pencil was $30. The total cost of 1 file and 4 pencils was $15. He spent a total of $72. How many files did George buy?
4 m

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George bought the same number of files and pencils. The total cost of 4 files and 1 pencil was $30. The total cost of 1 file and 4 pencils was $15. He spent a total of $72. How many files did George buy?