|A) Rs. 19.50||B) Rs. 19|
|C) Rs. 18||D) Rs. 18.50|
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.