Task: Question Answering
Input (English): Problem: what ratio must a shopkeepermix peas and soybean of rs. 16 and rs. 25 / kg, as to obtain a mixture of rs. 19.50 ?
Options: a. 10: 7, b. 9: 8, c. 11: 7, d. 13: 11, e. 14: 8
Output (English): c