A and B together can do a piece of work in 6 days and A alone can do it in 14 days. In how many days can B alone can do it?  Choose the correct choice from the following choices.
A) 12 days B) 15 days C) 21/2 days D) 21 days E) 22 days
Explanation:   A and B can do work 1/6 in 1 day   A alone can do 1/14 work in 1 day   B alone can do (1/6 -1/14) =2/21 work in 1 day   =&gt; complete work can be done in 21/2 days by B   Answer: Option 21/2 days
<result>C</result>
A and B together can do a piece of work in 6 days and A alone can do it in 14 days. In how many days can B alone can do it?