In what ratio must rice at ₹20/kg be mixed with rice at ₹30/kg so that the average price is ₹25/kg?
1 : 1
Using the rule of alligation with mean price ₹25, the ratio of cheaper (₹20) to dearer (₹30) is \((30 - 25) : (25 - 20)\) = 5 : 5.
This simplifies to 1 : 1.
Hence, the answer is 1 : 1.
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