X completes a work in 20 days and Y complete the same work in 30 days. If both of them work together, then the number of days required to complete the work will be?	Choose the correct choice:
A) 10 days. B) 12 days. C) 14 days. D) 8 days. E) 20 days.
If X can complete a work in x days and Y can complete the same work in y days, then, both   of them together can complete the work in x y/ x+ y days   Therefore, here, the required number of days = 20Ã— 30/ 50 = 12 days.   12 days.)
<result>B</result>
X completes a work in 20 days and Y complete the same work in 30 days. If both of them work together, then the number of days required to complete the work will be?