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enthada | 13:45 Thu 18th May 2006 | Quizzes & Puzzles
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The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member.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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40 years


I make it 36 (9*4)

I make it 36 years as well.

40


Say each member is 40 today=400 years total


4 years ago 9 members were 36=324 years total so 10th man must have been 76 (to make total 400)


Today that 76 year old man is 80 ie 40 years older than his replacement


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