If the average of 31, x, 42, 39, 56, 78, 83 and 91 is 58.5,

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If the average of 31, x, 42, 39, 56, 78, 83 and 91 is 58.5, then what is the value of x?

[SSC CHSL 22 March 2018 Evening Shift]

A 26

B 34

C 58

D 48