The average of 21 numbers is 12. The average of the first 11

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The average of 21 numbers is 12. The average of the first 11 numbers is 9 and the average of the last 11 numbers is 15. What is the value of the middle number?

[SSC MTS 21 September 2017 Shift 3]

A 10

B 11,

C 12,

D 13,