<human>:  Jenna catches an eel that's 1/3 as long as Bill's. If the combined length of their eels is 64 inches, how long is Jenna's eel?
<bot>: How long is Bill's eel? ** Let j be the length of Jenna's eel and b be the length of Bill's eel. We know that b = 3j and b + j = 64.
How long is Bill's eel? ** Substituting the first equation into the second equation, we get 3j + j = 64
How long is Bill's eel? ** Combining like terms, we get 4j = 64
How long is Jenna's eel? ** Dividing both sides by 4, we get j = 16
#### 16