Question
The average age of 24 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 = 25 × 21 = 525 Sum of the age of children after excluding = 24 × 20 = 480 Teacher’s age = 525 – 480 = 45 years
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