Question
A box of tarts cost $7 while a box of macarons cost $15. Each box contained either 9 tarts or 4 macarons. Jen bought the same number of tarts and macarons. She paid $321 more for the macarons. How many boxes of tarts did she buy?
4 m

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A box of tarts cost $7 while a box of macarons cost $15. Each box contained either 9 tarts or 4 macarons. Jen bought the same number of tarts and macarons. She paid $321 more for the macarons. How many boxes of tarts did she buy?