# How younger he is from his counterpart?

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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?

posted Jul 23, 2014

may be a is the age of old member at first time
b is the age of younger one afer 4 year

so (a+x)/10 = (b+x+36)/10
now its gives result
a=b+36
though it was the younger ones present age so difference will be 36-4=32

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