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Solving problems by elimination method in the fifth grade of primary school
Set x kilograms of rice per bag and y kilograms of flour per bag.

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.

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