Question
The average age of 25 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?Solution
Sum of the age of total children and teacher = 26 × 20 = 520 Sum of the age of children after excluding = 25 × 19 = 475 Teacher’s age = 520 – 475 = 45 years
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