Task: Question Answering
Input (English): Problem: a man invests some money partly in 15 % stock at 105 and partly in 8 % stock at 40. to obtain equal dividends from both, he must invest the money in the ratio :
Options: a. 3: 4, b. 3: 5, c. 7: 5, d. 16: 15, e. none
Output (English): c