Task: Question Answering
Input (English): Problem: 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 ? 
Options: a ) 68 days , b ) 70 days , c ) 73 days , d ) 75 days , e ) 77 days
Output (English): d