A and B can do a piece of work in 9 days. With the help of C they finish the work in 6 days. C alone can do that piece of work in?
Choose the correct choice from the following choices:
A) 33
B) 878
C) 18
D) 88
E) 11
18 = 1/6 â€“ 1/9 = 1/18 =&gt; 18 days   Answer: 18
<result>C</result>
A and B can do a piece of work in 9 days. With the help of C they finish the work in 6 days. C alone can do that piece of work in?