Task: Question Answering
Input (English): Problem: in what ratio must tea at rs. 62 per kg be mixed with tea at rs. 72 per kg so that the mixture must be worth rs. 64.50 per kg ?
Options: a. 3: 1, b. 2: 1, c. 5: 2, d. 3: 2, e. 3: 4
Output (English): a