A can do a piece of work 60 days. B can do work in 90 days. In how many days they will complete the work together? Choose the correct choice from the following answers:  A) 36 days  B) 32 days  C) 19 days  D) 17 days  E) 18 days

Rationale: lcm = 180 , ratio = 60 : 90 = 2 : 3 no of days = 180 / ( 2 + 3 ) = 180 / 5 = 36 days answer : a
Answer: A