In what ratio should a variety of rice costing $6 per kg be mixed with another variety of rice costing $8.75 per kg to obtain a mixture costing $7.50 per kg?	Choose the correct choice from the following answers.
A) 4/7	B) 5/6	C) 5/9	D) 4/8	E) 3/8
5/6   5/6   Let us say the ratio of the quantities of cheaper and dearer varieties = x : y   5/6y the rule of allegation, x/y = (87.5 - 7.50) / (7.50 - 6) = 5/6
<result>B</result>
In what ratio should a variety of rice costing $6 per kg be mixed with another variety of rice costing $8.75 per kg to obtain a mixture costing $7.50 per kg?