To find out how long an employee must work to make $80 at a rate of $20 per hour, you can set up a proportion.
The proportion can be set up as follows:
\[ \frac{20}{1} = \frac{80}{x} \]
This corresponds to the second option in your list:
20 over 1 is equal to 80 over x
So the correct response is:
20 over 1 is equal to 80 over x