Question

Renata and david want to cover the walls in one room of their house with wall paper.

Answer 1

For this case we have the following variables:
 P = area covered by a roll of wallpaper
 w = the total area of the walls
 n = number of rolls to buy
 We write the equation for n.
 You must take into account that you can determine this amount by dividing the total area between the area covered by each roll of paper.
 We have then:
 $n = w / P$ 
 Answer:
 a formula that will help them determine how much wall paper they'll need to purchase is:
 $n = w / P$