Mathematics
NULL
Medium
Question
A 9-member committee has the same average age as 2 years ago after an older member is replaced by a younger one. How much younger is the new member?
A
7 years
B
11 years
C
18 years
✓ Official correct answer
D
27 years
Community credibility
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A
7 years
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B
11 years
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C
18 years
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D
27 years
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Explanation
To offset a 2-year rise for 9 people, the replacement is 18 years younger. So 18 years.