If A, B and C together can finish a piece of work in 4 days. A alone in 12 days and B in 18 days, then C alone can do it in? Choose the most appropriate option:
A) 8 B) 6 C) 5 D) 9 E) 1
C = 1/4 - 1/12 – 1/18 = 1/9 =&gt; 9 days   Answer: 9
<result>D</result>
If A, B and C together can finish a piece of work in 4 days. A alone in 12 days and B in 18 days, then C alone can do it in?