A and B can do a piece of work in 8 days. With the help of C they finish the work in 4 days. C alone can do that piece of work in? Choose the correct choice from the following choices.
A) 40 days  B) 20 days  C) 8 days  D) 60 days  E) 40 days
8 days   8 days   8 days = 1/4 – 1/8 = 1/8 =&gt; 8 days
<result>C</result>
A and B can do a piece of work in 8 days. With the help of C they finish the work in 4 days. C alone can do that piece of work in?