Mr X mixed 10 kg of variety A rice with 15 kg of variety B rice and sold the mixture at a price 40% more than that of A. He did not get any profit.What is the ratio of the cost price of variety A to that of B per kg?  Choose the correct choice from the following answers:
A) 2:5  B) 3:5  C) 4:5  D) 5:8  E) 8:5
Let Rs X, Rs Y be the cost price per kg of variety A and variety B of rice   By data 10X + 15Y = 25 (1.4) X.   Since sale price of the mixture is 40% more than the cost price or A.   Therefore 10X + 15Y 10  + 15= 
<gadget id="calculator"> 10  + 15</gadget>
<output>25</output>
25 (1.4) X.   Since sale price of the mixture is 40% more than the cost price or A.   Therefore 10X + 15Y= 35X   Thus,15Y = 25X.   Hence, X : Y = 15 : 25 = 3 : 5   ANSWER:3:5
<result>B</result>
Mr X mixed 10 kg of variety A rice with 15 kg of variety B rice and sold the mixture at a price 40% more than that of A. He did not get any profit.What is the ratio of the cost price of variety A to that of B per kg?