Question
Henry bought the same number of pens and files. The total cost of 3 pens and 1 file was $18. The total cost of 1 pen and 3 files was $22. He spent a total of $100. How many pens did Henry buy?
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Henry bought the same number of pens and files. The total cost of 3 pens and 1 file was $18. The total cost of 1 pen and 3 files was $22. He spent a total of $100. How many pens did Henry buy?