A can paint a house in 42 days and B can do it in 21 days. A

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A can paint a house in 42 days and B can do it in 21 days. Along with C, they can finish the job in 7 days only.C alone can do the painting job in how many days, ?

[2017 SSC CGL 19 Aug Shift-2]

A 9

B 12

C 14

D 15