Question
In a box, 70% of the pens are pink pens and the rest are black and purple pens. The number of purple pens is twice the number of black pens. What percentage of the pens in the box are black pens?
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In a box, 70% of the pens are pink pens and the rest are black and purple pens. The number of purple pens is twice the number of black pens. What percentage of the pens in the box are black pens?