4x+8y=440
3x+2y=2 10(650-440) transformation 12x+8y=840.
12x+8y=840 Subtract 4x+8y=440 to get 8x=400, x=50, substitute 4x+8y=440, y=30,
That is, 50 kilograms of rice per bag and 30 kilograms of flour per bag.