Answer
You must work 9 hours.
Work Step by Step
We first write an equation representing this word problem. We then solve the equation to find:
$$ 250 = (25)(7.75) + 6.25 x \\ 250 = 193.75 + 6.25 x \\56.25 = 6.25 x \\ x =9$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.