Question
Xuan has twice as many pens as Olivia. After Olivia has bought another 90 pens, Olivia has twice as many pens as Xuan. How many pens does Olivia have at first?
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Xuan has twice as many pens as Olivia. After Olivia has bought another 90 pens, Olivia has twice as many pens as Xuan. How many pens does Olivia have at first?