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?
Correct answer: B
Explanation
Avg age of 1st 7 people tot/7=21
tot=147
Total after Vijay's arrival 147+29 = 176/8= 22
After Marry's arrival 176+29= 205
After Nikhils' arrival the mean increased to 30
Let Nikhil's age be x
205+x/10=30
205+x=300
x=95
B
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