The average age of 22 children and their teacher's age are 20 years. If the teacher's age is excluded, the average reduces by 1. What is the teacher's age?
Sum of the age of total children and teacher = 23 × 20 = 460 Sum of the age of children after excluding = 22 × 19 = 418 Teacher’s age = 460 – 418 = 42 years
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