Amit and Ananthu can do a work in 10 days and 20 days respectively. Amit started the work and left after 2 days. Ananthu took over and completed the work. In how many days was the total work completed? Choose the correct choice from the following answers:
A) 18 days
B) 20 days
C) 23 days
D) 25 days
E) 27 days

Rationale: amit ’ s one day ’ s work = 1 / 10 amit ’ s 2 day ’ s work = 1 / 10 * 2 = 1 / 5 work left = 1 - 1 / 5 = 4 / 5 ananthu ’ s one day ’ s work = 1 / 20 ananthu can do work in = 4 / 5 * 20 = 16 days so total days = 16 + 2 = 18 days answer : a
Answer: A