The average age of 30 scholars of a students in a class is 12 . the average age of a group of 5 students is 10 years and that of another group of 5 students is 14 year. find the average age of remaining students.
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The total age of the 30 students = 30*12 = 360 years.
The total of the first 5 students = 5*10 = 50 years.
The total of the next 5 students = 5*14 = 70 years.
So the total of the remaining 30–5–5 or 20 students = 360–50–70 = 240 years.
Or the average age of the remaining 20 students = 240/20 = 12 years.
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