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Answer:
x = small containers
y = medium containers
z = large container

Therefore:
11x + 8y + z = 8,4
x + 2y + z = 2x + 4y
8x + 2y = 2x + 4y.

Remove z in the first two equations and calculate x and y
Solution is :
x = 0,2 kg
y = 0,6 kg
z = 1,4 kg

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