The average age of 10 members of the board of directors of a company is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member?
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4 years back: Let the sum of nine directors (total) =x The age of the old director who was replaced=z The board’s average 4 yrs before=(x+z)/10.
Present time: After 4 yrs let z be replaced by y. So now the average age of the board is=(x+4*9+y)/10 Now (x+z)/10=(x+36+y)/10 So after solving it found z=y+36. z-y=36
Now this gives us the difference between the Old person’s age four years back and the younger member’s current age. Their difference will be (z+4)-y= 40
So the old person is 40yrs older than young one.
40 is the answer .. becoz if we appply the formula for average calculation for the present year and the average for the 10 people 4 years ago we ll get old persn’s age minus the young person’s age ll be 40 .. !!
you got it right shikha
you got it right mohit
you got it right hamza
check the solution yogesh
you got it right jitendra
According to me it should be 40
you got it right Avishek
Answer is 40 in my opinion….
you got it right Shivanandan