Question
Cindy has a total of 78 pens. She has 34 more black pens than grey pens. She has twice as many green pens as black pens. How many black pens does she have?
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Cindy has a total of 78 pens. She has 34 more black pens than grey pens. She has twice as many green pens as black pens. How many black pens does she have?