The average age of 24 students in a classis 10,if the teachers age is included , the average increase by one .what is the age of teacher

  1. 30
  2. 35
  3. 75
  4. 29

Average = sum of all values/total number of values

Sum of all values = total numb of values  x  Average

=24*10=240

=25*11=275

Age of teacher=275-240=35