To find the unit rate, you need to divide the total number of cupcakes by the number of boxes.
So, you would perform the calculation:
\[ \text{Cupcakes per box} = \frac{57 \text{ cupcakes}}{3 \text{ boxes}} = 19 \text{ cupcakes per box} \]
Thus, the unit rate is 19 cupcakes per box.
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