5 persons standing in queue with different age groups, after two years their average age will be X (I couldn't remember) and 6th person joined with them hence the current average age has become Y (I couldn't remember). Find the age of seventh person?

• let the sum of 5 person's age be A.
  ((A-10)/5)=X.(BEFORE 2 YRS FOR 5PERSONS)
  LET 6TH PERSONS AGE BE B
  ((A+B)/6)=Y.
  BY SOLVING THESE EQN U CAN GET THE AGE OF 6th person.
  
• 12 years agoHelpfull: Yes(3) No(1)
• sum of 6 persons =say=75
  sum of age of 7 perssons=82
  so age of 7th person=82-75=7kg....thats it
• 12 years agoHelpfull: Yes(0) No(3)
• assume the avg age of 5 prsns 2 years ago is 48.(will be given in the question)
  Now(after 2 yrs) their avg age is 50.
  the total age is 48x5=240
  now a 6th person joins let his age be x.
  assume that the avg age now is 45.(It will be given in the question)
  so 240+x/6=45
  x=270-240
  x=30 yrs.
  
• 12 years agoHelpfull: Yes(0) No(0)
• 2 yrs ago age of 5 person is 5(x-2)where x is present age.
  now present age of 5 person is 5(x-2)+10
  after adding 6th person,current age of 6 person is 6y
  avg age of 7 person is......{5(x-2)+10+6y}/7
• 12 years agoHelpfull: Yes(0) No(0)