To find the unit rate, you divide the total number of stamps by the number of sheets.
In this case, you have 18 stamps on 3 sheets.
So, the calculation would be:
\[ \text{Stamps per sheet} = \frac{18 \text{ stamps}}{3 \text{ sheets}} = 6 \text{ stamps per sheet} \]
Therefore, the unit rate is 6 stamps per sheet.
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