A, B and C can do a work in 90, 30 and 15 days respectively. If they work together, in how many days will they complete the work?	Choose the correct choice from the following answers: A) 5 B) 6 C) 7 D) 8 E) 9
One days's work of A, B and C = 1/90 + 1/30 + 1/15   = (1 + 3 + 6)/90 = 1/9   A, B and C together can do the work in 9 days.   Answer:9
<result>E</result>
A, B and C can do a work in 90, 30 and 15 days respectively. If they work together, in how many days will they complete the work?