The average of 30 numbers is 12.The average of the first 20 of them is 11 and that of the next 9 is?

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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 The average of 30 numbers is 12. The average of the first 20 of them is 11 and that of the next 9 is
The average of 20 numbers is 12. The average of the first 12 numbers is 11 and that of the next 7 ? The average of 20 numbers is 12. The average of the first 12 numbers is 11 and that of the next 7 ?
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30. The average of 30 numbers is 15. The average of the first 18 numbers is 10 and that || edu214 30. The average of 30 numbers is 15. The average of the first 18 numbers is 10 and that || edu214
67. The average of 20 numbers is 12. The average of the first 12 numbers is 11 and that of || edu214 67. The average of 20 numbers is 12. The average of the first 12 numbers is 11 and that of || edu214
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