Mathematics · Averages
The average weight of some children in a group was 48 kg. When 14 children with an average weight of 53.5 kg joined the group and 12 children with an average weight of 56.5 kg left the group, the average weight of the children then in the group decreased by 1 kg as compared with the original average. The number of children initially in the group was:
- 133
- 218
- 328
- 423✓
Correct answer
23
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