A small business has three employees who make cheerleader bows. Brielle earns per hour and decorates bows each hour on average. Tara earns per hour and decorates bows each hour on average. Mandy was recently employed and earns per hour. She decorates bows each hour on average. In one week, the employees work for hours, decorated bows, and earned a total of in wages. How many hours did Brielle work?