The average age of the first seven people to arrive at Nikhil’s birthday is 21. When Vijay (29) arrived, the mean age is increased to 22. Marry (also 29) arrived next. The tenth and last person to arrive at Nikhil's party is Nikhil himself, and the mean age increased to 30 years. How old is Nikhil on his birthday?

• Avg age of 1st 7 persons tot/7=21
  
  tot=147
  
  Total after vijay's arrival 147+29 = 176/8= 22
  
  After marry's arrival 176+29= 205
  
  After nikhils'a arrival mean increaded to 30
  Let nikhil's age be x
  
  205+x/10=30
  
  205+x=300
  
  x=95
  
  So age of nikhil is 95
• 10 years agoHelpfull: Yes(13) No(0)
• 95years
  let nikhil's age be x
  (21*7+29*2+x)/10=30
  x=95
• 10 years agoHelpfull: Yes(1) No(0)