Question 367045
20 students average = 86
total of 20 students = 86 * 20 = 1720
..
5 students average =  81
total of 5 students = 5*81 = 405
..
Average of class = total of 25 / number
Average = 1720 +405 / 25
average = 2125/25
Average = 85 of the entire class
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