To determine how much whole-wheat flour each loaf contained, we need to divide the total amount of flour used by the number of loaves.
The total amount of flour used is:
\[ \frac{7}{8} \text{ cups} \]
The recipe makes 7 equal-sized loaves, so we will divide \(\frac{7}{8}\) by 7:
\[ \text{Amount of flour per loaf} = \frac{7}{8} \div 7 \]
Dividing by 7 is the same as multiplying by \(\frac{1}{7}\):
\[ \text{Amount of flour per loaf} = \frac{7}{8} \times \frac{1}{7} \]
Now, multiplying the fractions:
\[ \text{Amount of flour per loaf} = \frac{7 \times 1}{8 \times 7} = \frac{7}{56} \]
Now we simplify \(\frac{7}{56}\):
\[ \frac{7}{56} = \frac{1}{8} \]
Thus, each loaf contains:
\[ \frac{1}{8} \text{ of a cup} \]
The answer is \(\frac{1}{8}\) of a cup.