To determine how many slices of the cherry pie they ate, we first need to find out the fraction of the peach pie they consumed.
Quinten and his friends ate \( 6 \) slices of the peach pie, which was cut into \( 12 \) slices. Therefore, the fraction of the peach pie they ate can be calculated as:
\[ \frac{6}{12} = \frac{1}{2} \]
Next, since they ate the same fraction of the cherry pie, we need to apply the same fraction to the cherry pie, which is cut into \( 8 \) equal slices.
To find how many slices they ate from the cherry pie, we calculate:
\[ \frac{1}{2} \times 8 = 4 \]
Thus, they ate \( 4 \) slices of the cherry pie.
The answer is:
4