Task: Question Answering
Input (English): Problem: an alloy of copper and zinc contains copper and zinc in the ratio 8: 2. another alloy of copper and zinc contains copper and zinc in the ratio 4: 6. in what ratio should the two alloys be mixed so that the resultant alloy contains equal proportions of copper and zinc ?
Options: a. 5: 1, b. 4: 1, c. 3: 1, d. 6: 1, e. 8: 1
Output (English): c