The average age of 20 students in a class is 12 years. If the age of the teachers is also added then the average becomes 13 years. Find out the age of the teacher?

• 21*13 - 20*12=33 yrs
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• TOTALavg age of total student 24*12=288
  teacher is added then new avg is 25*13=325
  then teacher age is - 325-288=37 years
  
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• 33 YEARS TEACHERS AGE= (21*13)-(12*20)
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• X/20=12 THEN X=240;
  (240+Y)/21=13 THEN Y=33
  THEREFORE ANS IS 33 YEARS
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• 20*12=240
  21*13=273
  240-273=33
  
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