A and B together can do a piece of work in 6 days and A alone can do it in 10 days. In how many days can B alone can do it?
Select the correct option:
A) 12 days  B) 18 days  C) 15 days  D) 21 days  E) 22 days
Explanation:   A and B can do work 1/6 in 1 day   A alone can do 1/10 work in 1 day   B alone can do (1/6 -1/10) =1/15 work in 1 day   =&gt; complete work can be done in 15 days by B   Answer: Option 15 days
<result>C</result>
A and B together can do a piece of work in 6 days and A alone can do it in 10 days. In how many days can B alone can do it?