Three groups of 120, 140, and 180 students appeared for an exam, and their pass percentages were 70%, 60%, and 90% respectively. What is the pass percentage for the entire group of students?

In a town with 30,000 professionals, teachers make up 11% of the total professionals. If 46% of teachers are male, what is the number of female teachers in the town?

In a town's professional breakdown, doctors represent 18% and clerks represent 8% of the total professionals. If the number of doctors is 3000 greater than the number of clerks, what is the total number of professionals in the town?