The average age of a class is 12 years and total age is 300 years. If a student of age 15 years is now admitted then find the average of the new class.

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1. explanation b likh dyta ha.

   Let NO of students in class =x
   As, avarage age of a class =12year
   Total age of a class=300
   According to formula,
   12 = 300/x
   x = 300/12
   x = 25
   By adding new student of age is “15”
   then,
   Average age of class = (300 + 15)/26
   = 12.11 years

   Reply

   1. Thank alot

      Reply

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