Task: Question Answering
Input (English): Problem: in the first m games of a team ' s season, the ratio of the team ' s wins to its losses was 1: 2. in the subsequent n games, the ratio of the team ´ s wins to losses was 2: 3. if m: n = 4: 5, what was the ratio of the team ' s wins to its losses for all m + n games ?
Options: a. 7: 18, b. 9: 23, c. 10: 17, d. 23: 54, e. 31: 77
Output (English): c