Mathematics · Averages
A group consists of 20 people with an average age of 35 years. The group is divided into two subgroups: Group A with 10 people whose membership remains unchanged, and Group B with the other 10 people. In Group B, 4 members aged 40, 38, 36, and 34 years left and were replaced by 4 new members whose average age is 30 years. The new average age of the entire group is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 11.6 years less than the original average age
- 21.4 years more than the original average age
- 31.6 years more than the original average age
- 41.4 years less than the original average age✓
Correct answer
1.4 years less than the original average age
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