The average of 20 results is 30 out of which the first 10 results are having an average of 10. The average age of the rest of 10 results is

The average of 20 results is 30 out of which the first 10 results are having an average of 10. The average age of the rest of 10 results is

1). 50
2). 40
3). 20
4). 25

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