A can do a piece of work in 8 days. B can do it in 16 days. With the assistance of C they completed the work in 4 days. Find in how many days can C alone do it?  Choose the correct choice from the following choices.
A) 87 days  B) 20 days  C) 26 days  D) 19 days  E) 16 days
C = 1/4 - 1/8 - 1/16 = 1/16   =&gt; 16 days   Answer:16 days
<result>E</result>
A can do a piece of work in 8 days. B can do it in 16 days. With the assistance of C they completed the work in 4 days. Find in how many days can C alone do it?