If 1/4 4th of the wall is painted blue, 1/2 is painted

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If 1/4 4^th of the wall is painted blue, 1/2 is painted yellow and remaining 3 m is painted white, what is the length of the wall?

[RRB NTPC 29 March 2016 Shift 1]

A 10

B 8

C 16

D 12