Task: Question Answering
Input (English): Problem: the ratio between the number of sheep and the number of horses at the stewart farm is 5 to 7, if each horse is fed 230 ounces of horse food per day and the farm needs a total 12,880 ounces of horse food per day, what is the number of sheep in the farm ?
Options: a. 18, b. 28, c. 40, d. 56, e. 60
Output (English): c