In what proportion should rice priced at Rs. 6 per kg be blended with rice priced at Rs. 8.75 per kg to create a mixture costing Rs. 7.50 per kg?

Explanation

Let the quantities of the cheaper and costlier rice be in the ratio x : y. Using the rule of allegation, the ratio is calculated as (8.75 - 7.50) / (7.50 - 6) = 1.25 / 1.50 = 5 / 6. Thus, the rice varieties should be mixed in the ratio 5 : 6.