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