Planning a work schedule

Question

Thomas can earn $5 an hour for working at the college library and $9 an hour for construction work. To save time for study, he wants to limit his work to 20 hours a week but still earn more than $125. How many hours can he work at the library?

Answer 1

c represents the hours of construction

20 - c represents the hours of library

9c + 5(20 - c) > 125

 

Can you solve for c and answer?