In seven given numbers, the average of first four numbers is 4 and that of the last four numbers is also 4. If the average of these seven numbers is 3 , then the fourth number is

A) 9
B) 8

C) 10
D) 11

Correct answer:
D) 11

Description for Correct answer:
Fourth number = (4 X 4 + 4 X 4 - 7 X 3) = 11

Please provide the error details in above question

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