How many rolls of wall paper does Rahwa need to buy to wall paper her room given the following:
Rahwa decides to wall paper her room in an interesting way. For two of
her walls which are 10 feet long and 8 feet high she puts vertical strips of
paper, and for the other two walls which are 12 feet long and 8 feet high she
puts the wall paper turned sideways, in horizontal strips. She throws away
the usual scraps of wall paper. Each roll of wall paper is 18 inches wide and
35 feet long.
Rahwa has to wall paper her room using a roll of wall paper that is 18 inches wide and 35 feet long.
For the first two walls that are 10 feet long and 8 feet high the wall paper is applied as vertical strips. 8 feet is equivalent to 96 inches. The number of rolls of wall paper required for these walls is the integer just greater than ` 96/18` or 6. 20 feet of each roll is used, or in all 120 feet of wall paper in length is required.
For the other two walls the wall paper is applied as horizontal strips. The number of rolls of wall paper required is the integral value just greater than `120/18` or 7. As the length of each strip is 16 feet, the length of wall paper required is 112 feet.
In all, 120 + 112 = 232 feet of wall paper is required. `232/35 ~~ 6.62` . This would require a purchase of 7 rolls of wall paper.
To wall paper all the four walls requires to buy 7 rolls of wall paper.