Task: Question Answering
Input (English): Problem: a and b are partners in a business . a contributes 1 / 4 of the capital for 15 months and b received 2 / 3 of the profit . for how long b ’ s money was used ? 
Options: a ) 4 months , b ) 6 months , c ) 8 months , d ) 10 months , e ) none
Output (English): d