To determine how many slices of the blueberry pie they ate, we first need to find the fraction of the apple pie that they consumed.
The apple pie was cut into 6 equal slices, and they ate 56 slices of it. This seems incorrect since they cannot eat more slices than are in the pie. If Hassem and his family ate all of the slices from the apple pie, then that means they consumed the entire apple pie.
Next, if they ate the entire apple pie (6 out of 6 slices), we assume they also ate the same fraction of the blueberry pie: \[ \text{Fraction of apple pie eaten} = \frac{6}{6} = 1 \] Now we apply this fraction to the blueberry pie, which has 12 slices: \[ \text{Slices of blueberry pie eaten} = 1 \times 12 = 12 \text{ slices} \]
So, the correct answer is 12 slices.