Serena and Sienna both work for a company that pays 12 dollars per hour for the first 40 hours of work in a week. If an employee works beyond 40 hours, it is considered overtime, and the overtime pay is 18 dollars per hour (50% more). Last week Serena earned a total of 642 dollars, and Sienna earned a total of 456 dollars. How many hours did Serena and Sienna work in total?

Potatobird Jan 10, 2021