Answer:
P=72-B
Explanation:
The situation says that there is a group of 72 people from which some bring their own supplies, b, and for the rest the supplies will be provided, p. So, this means that:
P+B= 72
The situation is asking for an equation to determine the number of people for whom supplies will be provided, p. This means that you will have to isolate p from the equation:
P= 72-B