एक शहर की जनसंख्या पहले वर्ष में 20% बढ़ जाती है, दूसरे वर्ष में 40% बढ़ जाती है और तीसरे वर्ष में 10% कम हो जाती है। यदि आज इसकी जनसंख्या 20,000 है, तो 3 वर्ष बाद इसकी जनसंख्या कितनी होगी?

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?