Question

the average age of 10 members of the board of directors of the ministry of finance is the same as it was 4 years ago, because an old member has been replaced by a young member. find how much younger the new member is

Answer 1

Answer:

4 years back sum of 10 members is 10x

Present

Let y is age of replaced candidate

9(x+4)+y =10x

9x+36+y=10x

36+y=x

So old person is replaced by 36+4=40years younger