Mathematics
Medium
Question
The average age 9 members of a committee are the same as it was 2 years ago, because an old number has been replaced by a younger number. Find how much younger is the new member than the old number?
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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