A, B and C can do a work in 18, 30 and 45 days respectively. If they work together, in how many days will they complete the work? Choose the correct choice from the following choices.
A) 9 B) 16 C) 17 D) 18 E) 11
One days's work of A, B and C = 1/18 + 1/30 + 1/45   = (5 + 3 + 2)/90 = 1/9   A, B and C together can do the work in 9 days.   9nswer:9
<result>A</result>
A, B and C can do a work in 18, 30 and 45 days respectively. If they work together, in how many days will they complete the work?