Question
Gwen has twice as many pens as Joelle. After Joelle has bought another 84 pens, Joelle has twice as many pens as Gwen. How many pens does Joelle have at first?
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Gwen has twice as many pens as Joelle. After Joelle has bought another 84 pens, Joelle has twice as many pens as Gwen. How many pens does Joelle have at first?