Question
Erika had twice as many marbles as Roshel. After Roshel bought another 84 marbles, Roshel had 4 times as many marbles as Erika. How many marbles did Erika have?
4 m

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Erika had twice as many marbles as Roshel. After Roshel bought another 84 marbles, Roshel had 4 times as many marbles as Erika. How many marbles did Erika have?