Question
Anna had thrice as many pens as marbles at first. She removed 7 pens and 3 marbles each time. In the end, there were 13 pens and 1 marble left. How many pens and marbles did Anna have at first?
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Anna had thrice as many pens as marbles at first. She removed 7 pens and 3 marbles each time. In the end, there were 13 pens and 1 marble left. How many pens and marbles did Anna have at first?