Question
Mark has a total of 38 of yellow and grey pens. 15 of the yellow pens and half of the grey pens are new. How many of his grey pens are new if he has a total of 13 new pens?
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Mark has a total of 38 of yellow and grey pens. 15 of the yellow pens and half of the grey pens are new. How many of his grey pens are new if he has a total of 13 new pens?