A and B can do a piece of work in 6 days. With the help of C they finish the work in 4 days. C alone can do that piece of work in?
Choose the most appropriate option:	A) 10 DAYS	B) 20 DAYS	C) 25 DAYS	D) 15 DAYS	E) 45 DAYS
C = 1/5 – 1/6 = 1/30 =&gt; 30 days   Answer:20 DAYS
<result>B</result>
A and B can do a piece of work in 6 days. With the help of C they finish the work in 4 days. C alone can do that piece of work in?