Answer: The required hourly wage of the assistant is $25.
Step-by-step explanation: Given that an instructor makes $15 more per hour than an assistant and the the combined hourly wage of the instructor and assistant is $65.
We are to find the hourly wage of the assistant.
Let $x be the hourly wage of the assistant.
Then, according to the given information, we have
Hourly wage of the instructor = $(x + 15).
Also, we have

Thus, the required hourly wage of the assistant is $25.