To find the fraction of the bouquet that is pink roses, we first need to determine how many pink roses are in the bouquet.
Since there are 12 roses in total and 5 of them are white, we can calculate the number of pink roses as follows:
\[ \text{Number of pink roses} = \text{Total roses} - \text{White roses} = 12 - 5 = 7 \]
Now, we can calculate the fraction of the bouquet that is pink roses:
\[ \text{Fraction of pink roses} = \frac{\text{Number of pink roses}}{\text{Total number of roses}} = \frac{7}{12} \]
Therefore, the answer is:
\[ \text{StartFraction 7 Over 12 EndFraction} \]