In what ratio should a variety of Rice costing Rs. 7 per kg be mixed with another variety of Rice costing Rs. 14.50 per kg to obtain a mixture costing Rs. 9.75 per kg?
Select:
A) 19:10
B) 19 :11
C) 11 :19
D) 12 :18
E) 11 :20
Let us say the ratio of the quantities of cheaper and dearer varieties = x : y   19 :11y the rule of allegation, x/y = (14.50 - 9.75) / (9.75 - 7) = 31/15   ANSWER:19 :11
<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. 14.50 per kg to obtain a mixture costing Rs. 9.75 per kg?