Question
Japheth has a total of 54 of black and green pens. 13 of the black pens and half of the green pens are new. How many of his green pens are new if he has a total of 21 new pens?
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Japheth has a total of 54 of black and green pens. 13 of the black pens and half of the green pens are new. How many of his green pens are new if he has a total of 21 new pens?