Sum of 30 students = $30 imes 15 = 450$. New sum (31 people) = $31 imes 16 = 496$. Teacher's age = $496 - 450 = 46$ years.
30 छात्रों का योग = $30 imes 15 = 450$। नया योग (31 लोग) = $31 imes 16 = 496$। शिक्षक की आयु = $496 - 450 = 46$ वर्ष।