In an examination, 58% of the candidates passed in English and 68% passed in Mathematics, while 17% failed in both Mathematics and English. If 2150 candidates passed in both subjects, how many candidates appeared in the examination?

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?