Task: Question Answering
Input (English): Problem: find the ratio in which rice at rs. 7.10 a kg be mixed with rice at rs. 5.70 a kg to produce a mixture worth rs. 6.30 a kg ?
Options: a. 1: 3, b. 2: 3, c. 3: 4, d. 4: 5, e. none of these
Output (English): c