Kenali wants to cut a piece of rope into three equal pieces, and she wants to have a $10$-foot piece remaining. Help her figure out how long to make each of the three equal pieces for each total length of rope given below.

1. A $25$-foot piece of rope (find $n$).
   

   Step 1(a):

   First, subtract $10$ from $25$ to find the amount left for the three equal parts.

   $25 \text{ feet} − 10 \text{ feet} = 15 \text{ feet}$

   Step 2(a):

   Next, determine how long each of the three pieces will be. If three pieces must add together to be $15$ feet, how long are they?

   $\frac{15}{3}=5\text{ feet}$

   Answer (a):

   $n = 5$ feet

2. A $310$-foot piece (find $x$).
   

   Hint (b):

   The process for solving this problem is the same as in part (a).
   Remember to subtract $10$ feet from the total before dividing it into three parts.

   Answer (b):

   $x = 100$ feet

3. A $13$-foot piece (find $j$).
   

   Hint (c):

   Follow the steps outlined in part (a).