AFCAT II 2011 Solved Paper

Let one variety of rice be x kg.
Another quantity = (50 – x) kg
According to question x × 4.50 + (50 – x) 5 = 240
4.5x + 250 – 5x = 240
0.5x = 10
x = 20
Hence, the quantity of cheaper rice was 20 kg.