Avg age of X number of adults in a class is 30yrs. If 12 new adults with avg age of 32 joined with them then the avg age increases by one. Find X?

• Total age of X adults = 30x
  total age of 12 new adults = 32*12= 384
  Total age of x+12 persons = (x+12)*31 = 30x+384
  hence
  31x+372 = 30x+384
  x= 12
• 12 years agoHelpfull: Yes(30) No(3)
• Starting X members
  total members=X+12
  Avg of X+12 members=>(X.30+12.32)/(X+12)=31
  X=12
• 12 years agoHelpfull: Yes(15) No(2)
• initial sum=30*x
  then final eq. (32*12+30*x)/(12+x)=31
  so x=12
• 12 years agoHelpfull: Yes(4) No(2)