X does a work in 15 days. Y does the same work in 30 days. In how many days they together will do the same work? Choose the correct choice from the following choices:
A) 10
B) 12
C) 20
D) 30
E) 15
X's 1day's work= 1/15   Y's 1 day's work=1/30   (X+Y)'s 1day's work= (1/15+1/30)=1/10   both together will finish the work in 10 days.   correct option is 10
<result>A</result>
X does a work in 15 days. Y does the same work in 30 days. In how many days they together will do the same work?