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?
Choose the correct choice from the following: A) 94 B) 95 C) 96 D) 97 E) 98
Avg age of 1st 7 people tot/7=21   tot=147   Total after Vijay's arrival  147+29= 
<gadget id="calculator"> 147+29</gadget>
<output>176</output>
176/8= 
<gadget id="calculator">176/8</gadget>
<output>22</output>
22   After Marry's arrival  176+29= 
<gadget id="calculator"> 176+29</gadget>
<output>205</output>
205   After Nikhils'  arrival the mean increased to 30   Let Nikhil's age be x   205+x/10=30   205+x=300   x=95   ANSWER:95
<result>B</result>
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?