Answer :
Ted bought 3 notebooks and 5 folders for $27
You know that each notebook cost $4, to the cost for the notebooks he bought can be calculated as the price per notebook multiplied by the number of notebooks bought:
[tex]3\cdot4=12[/tex]→ He spent $12 on the three notebooks.
Let "f" represent the cost per folder, then 5f represents the cost of all folders, we know that the notebooks plus the folders cost $27, then:
[tex]12+5f=27[/tex]From this expression, you can determine the cost of each folder, first subtract 12 from both sides of the equation:
[tex]\begin{gathered} 12-12+5f=27-12 \\ 5f=15 \end{gathered}[/tex]Now divide both sides by 5 to determine the value of "f":
[tex]\begin{gathered} \frac{5f}{5}=\frac{15}{5} \\ f=3 \end{gathered}[/tex]f=3 → This means that each folder costs $3