A can finish a work in 18 days and B in 36 days. If they wor

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A can finish a work in 18 days and B in 36 days. If they work on it together for 9 days, then what percent of work is left?

[2017 SSC CGL 17 AUG Shift 1]

A 33.3

B 20

C 75

D 25