A group of 72 people travel to the beach for a clean-up day. Some of the people bring their own supplies (such as gloves, water,
and garbage bags). Supplies are provided for the rest of the people. Write an equation for the number of people for whom supplies will be provided, p, if b people bring their own supplies.
You start with 72, then take away the people bringing their own supplies (b), and that equals the number of people that will have supplies provided for them (p).
