Task: Question Answering
Input (English): Question: Mr X mixed 10 kg of variety A rice with 15 kg of variety B rice and sold the mixture at a price 40% more than that of A. He did not get any profit.What is the ratio of the cost price of variety A to that of B per kg?

 Option A: 2:5

 Option B: 3:5

 Option C: 4:5

 Option D: 5:8

 Option E: 8:5
Output (English): Option B