the average age of 12 students is 15 yrs. if the average age of first 2student is 20 yrs then the average of the remaining students is
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24!
Avg age of 1st 10=22
Avg age of next 10=26
So, avg age of 20 students = (22+26)/2 =24
Since, the overall avg (i.e avg of 50 students) is 24 and the avg of 20 students is also 24, the average of remaining students (i.e 30 students) must be 24.
(Eg: (x+x)/2 = x)
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