A and B together can do a piece of work in 6 days and A alone can do it in 11 days. In how many days can B alone can do it? Choose the most appropriate option:
A) 12 days	B) 15 days	C) 66/5 days	D) 21 days	E) 22/5 days
Explanation:   A and B can do work 1/6 in 1 day   A alone can do 1/11 work in 1 day   B alone can do (1/6 -1/11) =5/66 work in 1 day   =&gt; complete work can be done in 66/5 days by B   Answer: Option 66/5 days
<result>C</result>
A and B together can do a piece of work in 6 days and A alone can do it in 11 days. In how many days can B alone can do it?