The average age of 30 children and their teacher's age are 25 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 = 31 × 25 = 775 Sum of the age of children after excluding = 30 × 24 = 720 Teacher’s age = 775 – 720 = 55 years
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