Question
Erika spent $21 on macarons which costs $2.10 each. For every 3 macarons bought, she received one free macaron. How many macarons did she buy altogether?
3 m

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Erika spent $21 on macarons which costs $2.10 each. For every 3 macarons bought, she received one free macaron. How many macarons did she buy altogether?