A and B together can complete a work in 3 days. They start together but after 2 days,B left the work.If the work is completed after two more days, find the B alone could do the work?  Pick one.
A) 8
B) 20
C) 6
D) 21
E) 10
A and B(one day work)=1/3 part   (A+B) works 2 days together=2/3 part   Remaining work=1-(2/3) part=1/3 part   1/3 part of the work is completed by A in two days=(1/3)*(1/2)   One day's work of A=1/6 part   One day's work of B=(1/3)-(1/6)=1/6   So,B alone can do the work in 6 days   Answer is option 6
<result>C</result>
A and B together can complete a work in 3 days. They start together but after 2 days,B left the work.If the work is completed after two more days, find the B alone could do the work?