A can do a work in 12 days and B in 24 days. If they work on

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A can do a work in 12 days and B in 24 days. If they work on it together for 4 days, then what fraction of work is left?

[2017 SSC CGL 20 AUG Shift-1]

A 1/3

B 1/2

C 1/4

D 1/5