Question
Sabrina and Zoe had an equal number of pens at first. After Sabrina gave 11 pens to Zoe, Zoe had 28 pens. How many pens does Sabrina have in the end?
4 m

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Sabrina and Zoe had an equal number of pens at first. After Sabrina gave 11 pens to Zoe, Zoe had 28 pens. How many pens does Sabrina have in the end?