In what proportion should rice costing Rs. 7.20 per kg be combined with rice priced at Rs. 5.70 per kg to create a blend valued at Rs. 6.30 per kg?

Explanation

To find the mixing ratio, use the allegation method: The difference between Rs. 7.20 and Rs. 6.30 is Rs. 0.90, and between Rs. 6.30 and Rs. 5.70 is Rs. 0.60. The ratio is therefore 0.60:0.90, which simplifies to 1:3.