In what ratio should a variety of rice costing Rs. 7 per kg be mixed with another variety of rice costing Rs. 8.75 per kg to obtain a mixture costing Rs. 7.50 per kg?  Answers.
A) 5/6  B) 5/2  C) 5/1  D) 5/3  E) 7/6
Let us say the ratio of the quantities of cheaper and dearer varieties   = x : y   5/2y the rule of allegation, x/y   = (8.75 - 7.50) / (7.50 - 7) =5/2   Answer: 5/2
<result>B</result>
In what ratio should a variety of rice costing Rs. 7 per kg be mixed with another variety of rice costing Rs. 8.75 per kg to obtain a mixture costing Rs. 7.50 per kg?