SOLUTION: The average age of class 20 boys is 12 years. What will the average ago of class if 5 new boys join the class whose average age is 7 year.

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Question 991877: The average age of class 20 boys is 12 years. What will the average ago of class if 5 new boys join the class whose average age is 7 year.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
The average age of class 20 boys is 12 years.
What will the average ago of class if 5 new boys join the class whose average age is 7 year.
:
The equation when a total of 25 boys are in the class
a = %2820%2812%29%2B5%287%29%29%2F25
a = %28240%2B35%29%2F25
a = 275%2F25
a = 11 yrs is the average now