A can do a piece of work in 4 days. B can do it in 7 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it? Answers:
A) 22 days
B) 28/3 days
C) 67 days
D) 17/5 days
E) 18 days
C = 1/2 - 1/4 - 1/7 =3/28   =&gt; 28/3 days   Answer:28/3 days
<result>B</result>
A can do a piece of work in 4 days. B can do it in 7 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it?