There were 24 students in a class. One of them, who was 18 years old, left the class and his place was filled up by a new comer. If the average of the class was thereby lowered by 1 month, the age of new comer is

• let "x" be the avg b4 one of them left
  then total ll be 24x... After one of them left, total ll be 24x-18
  
  total age of 23 students=24x-18 --> (1)
  
  let d new comer age be "y"
  Avg lowered by 1 month means --> x-1/12
  total ll be 24(x-1/12) ==> 24x-2
  
  total age of 23 students = 24x-2-y --->(2)
  
  equate (1) and (2)
  
  v ll get y=16
  
  so the age of new comer is 16
  
• 10 years agoHelpfull: Yes(12) No(1)
• 16
  average lowered by 1 month means the new comers average is lowered by 24 months that is 2 years so the new comers average is 16
• 10 years agoHelpfull: Yes(3) No(0)