How Young Is The New Member As Compared To The Old One?

Crack this riddle!!


A society had 10 members.

A new member replaced an elderly member recently.

After which the average age of these members is the same as it was 4 years ago.

How young is the new member as compared to the old one?

So were you able to solve the riddle? Leave your answers in the comment section below.

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Answer:

Let the sum of nine member (total) = x
and the age of old one = z
so its average 4 yrs before = (x+z)
10

After 4 yrs let z be replaced by y.
so now avg = (x+4*10+y)
10

As the averages are equal we can write

(x+z)/10=(x+40+y)/10

So after solving it found

z=y+40.

so old person is 40yrs older than young one.

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