Amit and Ananthu can do a work in 15 days and 90 days respectively. Amit started the work and left after 3 days. Ananthu took over and completed the work. In how many days was the total work completed? Choose the correct choice from the following:
A) 68 days
B) 70 days
C) 73 days
D) 75 days
E) 77 days
Amit’s one day’s work= 1/15   Amit’s 3 day’s work = 1/15 *3 = 1/5   Work left= 1-1/5 = 4/5   Ananthu’s one day’s work= 1/90   Ananthu can do work in = 4/5 *90= 
<gadget id="calculator">4/5 *90</gadget>
<output>72</output>
72 days   So total days= 72+3= 
<gadget id="calculator">72+3</gadget>
<output>75</output>
75 days   ANSWER:75 days
<result>D</result>
Amit and Ananthu can do a work in 15 days and 90 days respectively. Amit started the work and left after 3 days. Ananthu took over and completed the work. In how many days was the total work completed?