एक संख्या में पहले 20% की वृद्धि की जाती है और फिर 20% की कमी की जाती है। संख्या में शुद्ध प्रतिशत परिवर्तन क्या होगा?

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?