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
• 9 years agoHelpfull: Yes(2) No(0)
• 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
  
• 9 years agoHelpfull: Yes(0) No(2)
• 33 YEARS TEACHERS AGE= (21*13)-(12*20)
• 9 years agoHelpfull: Yes(0) No(0)
• X/20=12 THEN X=240;
  (240+Y)/21=13 THEN Y=33
  THEREFORE ANS IS 33 YEARS
• 8 years agoHelpfull: Yes(0) No(0)
• 20*12=240
  21*13=273
  240-273=33
  
• 8 years agoHelpfull: Yes(0) No(0)