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