. The cost of Type 1 rice is Rs15 per kg and Type
2 rice is Rs.20 per kg. If both type - 1 and type - 2 are mixed in ratio of 2 : 3, then find the price per kg of the mixed variety of rice.
Let the price of mixed variety be Rs x per kg.
By the rule of alligation we have
Hence, the price of the mixture is Rs 18 per kg.