Final answer:
To express the number of notebooks each person received, divide the total number of notebooks by the number of friends. Each person received (w + 11) / 7 notebooks.
Step-by-step explanation:
To express the number of notebooks each person received, we need to divide the total number of notebooks by the number of friends. First, we add the number of notebooks added to w notebooks, which gives us w + 11 notebooks. Then, we divide this total by 7, as there are 7 friends. This can be written as \( \frac{{w + 11}}{7} \). So, each person received \( \frac{{w + 11}}{7} \) notebooks.