Question
Sarah has thrice as many pens as Kathy. After Kathy has bought another 70 pens, Kathy has twice as many pens as Sarah. How many pens does Kathy have at first?
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Sarah has thrice as many pens as Kathy. After Kathy has bought another 70 pens, Kathy has twice as many pens as Sarah. How many pens does Kathy have at first?