Question
Zara had four times as many erasers as Sarah. After Sarah bought another 91 erasers, Sarah had 2 times as many erasers as Zara. How many erasers did Zara have?
4 m

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Zara had four times as many erasers as Sarah. After Sarah bought another 91 erasers, Sarah had 2 times as many erasers as Zara. How many erasers did Zara have?