peter plans to build a tree house in his back yard. he needs to know how many square feet of lumber he should buy for the floor. he considers the greatest number of people who will be in the tree house at one time, and decides to allow 20 square feet of floor space per person.
which expression can peter use to determine the size of the floor, in square feet, if n represents the number of people?
20n
20 + n
20 – n
20/n