human
There are five times as many swordfish as pufferfish in an aquarium exhibit. If there are 90 fish total, how many pufferfish are there?
assistant
Define a variable ** Let s be the number of swordfish and p be the number of pufferfish. We know that s = 5p and s + p = 90.
Write an equation ** Substituting the first equation into the second equation, we get 5p + p = 90
Combine like terms ** Combining like terms, we get 6p = 90
Divide by 6 ** Dividing both sides by 6, we get p = 15
#### 15