Average of 9 numbers is 20. If a number 30 is also included,

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Average of 9 numbers is 20. If a number 30 is also included, then what will be the average of these 10 numbers?

[SSC MTS 9 October 2017 Shift 1]

A 20.5

B 21,

C 19.5,

D 21.5,