Question
Andy bought the same number of notebooks and markers. The total cost of 3 notebooks and 1 marker was $13. The total cost of 1 notebook and 3 markers was $15. He spent a total of $70. How many notebooks did Andy buy?
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Andy bought the same number of notebooks and markers. The total cost of 3 notebooks and 1 marker was $13. The total cost of 1 notebook and 3 markers was $15. He spent a total of $70. How many notebooks did Andy buy?