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 one
A) 6  B) 5  C) 7  D) 9  E) 2
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?