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 correct choice from the following.
A) 20	B) 22	C) 30	D) 10	E) 9
C = 1/4 - 1/12 â€“ 1/18 = 1/9 =&gt; 9 days   ANSW9R 9
<result>E</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?