Answer: The number of rolls of paper is [tex]2\dfrac{1}{2}[/tex].
Step-by-step explanation: Given that Andy is hanging wallpaper in his kitchen. 6 rolls of wallpaper is used to cover [tex]2\dfrac{2}{5}[/tex] of the walls.
We are to find the number of rolls of paper used per wall.
We will be using unitary method to solve the given problem.
We have,
[tex]2\dfrac{2}{5}=\dfrac{12}{5}.[/tex]
Now, number of rolls used to cover [tex]\dfrac{12}{5}[/tex] of the walls = 6.
Therefore, number of rolls used to cover 1 wall is given by
[tex]\dfrac{6}{\frac{12}{5}}=\dfrac{5\times 6}{12}=\dfrac{5}{2}=2\dfrac{1}{2}.[/tex]
Thus, [tex]2\dfrac{1}{2}[/tex] rolls of paper used per wall.
