A can do a piece of work in 4 days. B can do it in 5 days. With the assistance of C they completed the work in 3 days. Find in how many days can C alone do it?  Choose the correct choice from the following answers
A) 8 4/7 days	B) 20 days	C) 16 days	D) 19 days	E) 36 days
C = 1/3 - 1/4 - 1/5 = 7/60   =&gt; 60/7 = 8 4/7 days   8 4/7 daysnswer:8 4/7 days
<result>A</result>
A can do a piece of work in 4 days. B can do it in 5 days. With the assistance of C they completed the work in 3 days. Find in how many days can C alone do it?