In what ratio should a variety of oil costing Rs. 9 per ltr be mixed with another variety of oil costing Rs. 17.25 per ltr to obtain a mixture costing Rs. 11.75 per ltr?	Choose the correct answer
A) 4 : 1	B) 1 : 3	C) 3 : 1	D) 1 : 2	E) 2 : 1
Let us say the ratio of the quantities of cheaper and dearer varieties = x : y   By the rule of allegation, x/y = (17.25 - 11.75) / (11.75 - 9) = 22/11= 
<gadget id="calculator">22/11</gadget>
<output>2</output>
2/1   ANSW2 : 1R:2 : 1
<result>E</result>
In what ratio should a variety of oil costing Rs. 9 per ltr be mixed with another variety of oil costing Rs. 17.25 per ltr to obtain a mixture costing Rs. 11.75 per ltr?