Task: Question Answering
Input (English): Problem: if 20 % of a number is equal to three - fifth of another number , what is the ratio of first number to the second number ? 
Options: a ) 3 : 1 , b ) 2 : 1 , c ) 1 : 3 , d ) 1 : 2 , e ) 2 : 3
Output (English): a