Task: Question Answering
Input (English): Problem: a and b together have $ 1210 . if of a ' s amount is equal to of b ' s amount , what is the ratio between a and b ? 
Options: a ) 2 : 3 , b ) 3 : 2 , c ) 4 : 5 , d ) 5 : 3 , e ) can not be determined
Output (English): b