Question
Now we have a committee of 10 members, where age of all 10 members is same as it was 4 years ago, because an old member is replaced by young member? Find out how much younger is the new member?
Answers
Let say the sum of nine member = X and age of old man = Z
So its average 4 years before = (x+z)/10
After 4 years let Z be replaced by Y
So now avg=(x+4×10+y)/ 10
Now, (x+z)/10 = (x+40+y)/10
So in the end you will get z=y+40
So young committee member is 40 years younger than old member   Your Comment




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