The average age of 18 children and their teacher's age are 15 years. If the teacher's age is excluded, the average reduces by 2. What is the teacher's age?
Sum of the age of total children = 19 ×15 = 285 Sum of the age of children after excluding teacher = 18 ×13 = 234 Teacher’s age = 285 – 234 = 51 years
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