To find the proportion representing how long an employee must work to make $80 at a rate of $20 per hour, we can set it up as follows:
Let \( x \) represent the number of hours worked. The amount earned for \( x \) hours is \( 20x \).
We want to represent the relationship where the earnings (20 per hour) multiplied by hours (x) is equal to the total earnings ($80):
The proportion can be set up as:
\[ \frac{20}{1} = \frac{80}{x} \]
This is the correct representation. Thus, the correct response is:
20 over 1 is equal to 80 over x.