Task: Question Answering
Input (English): Problem: sushil got thrice as many marks in english as in science . his total marks in english , science and maths are 180 . if the ratio of his marks in english and maths is 1 : 2 , find his marks in science ? 
Options: a ) 19 , b ) 77 , c ) 66 , d ) 55 , e ) 31
Output (English): a