To determine how many full boxes of cereal Alondra has after combining the contents of her 5 boxes, we start by calculating the total amount of cereal she has.
Each box is \( \frac{3}{4} \) full, and she has 5 boxes. Therefore, the total amount of cereal can be calculated by multiplying:
\[ \text{Total cereal} = 5 \times \frac{3}{4} \]
Calculating this gives:
\[ \text{Total cereal} = \frac{15}{4} \]
Now, we need to convert \( \frac{15}{4} \) into boxes. To do this, we divide \( 15 \) by \( 4 \):
\[ \frac{15}{4} = 3.75 \]
This means that the total amount of cereal is equivalent to 3 full boxes and \( 0.75 \) of another box.
Thus, after combining all the cereal, Alondra will have enough to fill 3 full boxes and 3/4 of another box. If we only count the full boxes, then Alondra has enough cereal to fill 3 boxes completely, along with some leftover cereal.