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math & puzzles Online Quiz - 226
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The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member.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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A
40
💡 Explanation:
For 10 members, the total age increased by 10 × 4 = 40 years over 4 years. Since the average remained the same, the new member must be 40 years younger than the old member to compensate for this 40-year increase. The answer is 40 years.