Question
Mark bought the same number of pencils and markers. The total cost of 3 pencils and 1 marker was $18. The total cost of 1 pencil and 3 markers was $22. He spent a total of $90. How many pencils did Mark buy?
4 m

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Mark bought the same number of pencils and markers. The total cost of 3 pencils and 1 marker was $18. The total cost of 1 pencil and 3 markers was $22. He spent a total of $90. How many pencils did Mark buy?