The average age of eight girls is y years. 5 new girls having ages (in years) by y+3, y-6, y+15, y+8, and y+6, join the class. What is the new average age of the class? 

1
(y+2) years 
2
(y+6) years 
3
(y+3) years 
4
(y+1) years

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