The avg. age of a group of 12 students is 20yers.If 4 more students join the group,the avg age increases by 1 year.The avg age of the new student is?

• total age=12*20
  =240
  let the sum of age of four new student=x
  so the total avg become =(240+x)/16=21
  x=196
  then the avg age of new student is 196/4=49yr
  
• 9 years agoHelpfull: Yes(0) No(2)
• dd x would 96 then divid it by 4
  i.e x=336-240 , x=96
  now 96/4=24
• 9 years agoHelpfull: Yes(0) No(0)