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?

A 45 years Correct Answer Incorrect Answer
B 42 years Correct Answer Incorrect Answer
C 48 years Correct Answer Incorrect Answer
D 52 years Correct Answer Incorrect Answer

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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