Question
The average age of 20 children and their teacher's age
are 18 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 = 21 × 18 = 378 Sum of the age of children after excluding teacher = 20 × 17 = 340 Teacher’s age = 378 – 340 = 38 years
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