Chapter 8.CR, Problem 10CR

Alice’s mother wants to wallpaper two adjacent walls in Alice’s bedroom. She also wants to put a border along the top of all four walls. The bedroom is 9 ft by 12 ft by 8 ft high.

a) If each double roll covers approximately ${\text{60 ft}}^2$ and the wallpaper is sold in double rolls only, how many double rolls are needed?

b) If the border is sold in rolls of 5 yd each, how many rolls of the border are needed?