Answer: 6 hours
Step-by-step explanation:
First we need to write an equation to solve the problem.
(13.50 x 40) + 20.25x = $661.50
The first section represents her earnings for the first 40 hours, the second are the overtime hours, and it is set equal to her total earnings.
Now, to solve the equation:
540 + 20.25x = $661.50
Next, subtract 540 from both sides:
20.25x = 121.50
The last step is to divide both sides by 20.25
X = 6