Task: Question Answering
Input (English): Problem: john distributes his pencil among his 4 friends rose , mary , ranjan , and rohit in the ratio 1 / 2 : 1 / 3 : 1 / 4 : 1 / 5 . what is the minimum no . of pencils that the person should have ? 
Options: a ) 65 , b ) 68 , c ) 70 , d ) 77 , e ) 80
Output (English): d