Question
The average age of 23 children and their teacher's age
are 21 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 = 24 × 21 = 504 Sum of the age of children after excluding = 23 × 20 = 460 Teacher’s age = 504 – 460 = 44 years
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