Average of 15 numbers is 7. Out of them the average of first

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Average of 15 numbers is 7. Out of them the average of first 8 numbers is 6.5 and the average of last eight numbers is 9.5. The middle number is :

[Railways Group D 08 Dec 2016 With Answers]

A 21

B 22,

C 23,

D None of the above,