Average Age Puzzle
Average age of a 10 members committee is same as it was 4 years ago, because an old member is replaced by a younger member. What is difference between the younger member and the old member age.
Or in other words, how younger he is from his counterpart?
Lets say sum of the 10 members 4 years ago was S, now it should have been S+40. assume old member’s age was x(now) and younger members age is y(now).
S + 40 -x +y = S=> x -y = 40.
S + 40 -x +y = S=> x -y = 40.
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