Question
The average age of 15 children and their teacher's age
are 12 years. If the teacher's age is excluded, the average reduces by 2. What is the teacher's age?Solution
Sum of the age of total children = 16 × 12 = 192 Sum of the age of children after excluding teacher = 15 × 10 = 150 Teacher’s age = 192 – 150 = 42 years
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