Mathematics · Averages
The average weight of some persons in a group is 70 kg. When 15 persons with an average weight of 60 kg leave the group or 15 persons with an average weight of 87.5 kg join the group, the average weight of the group in both cases becomes equal. How many persons were there in the group initially?
- 165
- 255✓
- 345
- 435
Correct answer
55
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