X completes a work in 60 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? Options:
A) 30 days.	B) 50 days.	C) 25 days.	D) 10 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 = 60 Ã— 30/90 = 20 days.   20 days.)
<result>E</result>
X completes a work in 60 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?