The cost of Type 1 rice is Rs. 15 per kg and Type 2 rice is Rs.20 per kg. If both Type 1 and Type 2 are mixed in the ratio of 2 : 3, then the price per kg of the mixed variety of rice is?
Choose the correct choice: A) 22 B) 27 C) 18 D) 19 E) 11
Let the price of the mixed variety be Rs. x per kg. By the rule of alligation, we have :   Cost of 1 kg of type 1 rice Cost of 1 kg of type 2 rice   (20-x)/(x-15) = 2/3 60 - 3x = 2x - 30   5x = 90 x = 18.   Answer: 18
<result>C</result>
The cost of Type 1 rice is Rs. 15 per kg and Type 2 rice is Rs.20 per kg. If both Type 1 and Type 2 are mixed in the ratio of 2 : 3, then the price per kg of the mixed variety of rice is?