Question
Olivia had twice as many erasers as Kathy. After Kathy bought another 90 erasers, Kathy had 3 times as many erasers as Olivia. How many erasers did Olivia have?
4 m

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Olivia had twice as many erasers as Kathy. After Kathy bought another 90 erasers, Kathy had 3 times as many erasers as Olivia. How many erasers did Olivia have?