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The average of 30 numbers is 12. The average of the first 20 of them is 11 and that of the next 9 is 10. The last number is
5Q:
The average of 30 numbers is 12. The average of the first 20 of them is 11 and that of the next 9 is 10. The last number is
- 140false
- 250true
- 360false
- 445false
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