A can paint a house in 55 days and B can do it in 66 days. Along with C, they did the job in 12 days only. Then, C alone can do the job in how many days?
According to question,
(1/55+1/66+1/c)=1/12.
or, 1/c=(1/12)-(1/55)-(1/66)=
(55-12-10)/660=(1/20).
Ao, C will do in 20 days .
D is correct choice.
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