Question 1101090
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(x cartons of 0.6 L)  + (x cartons of 1 L) + (2x cartons of 2 L) = 84 L  ====>


0.6*x + 1*x + 2*(2x) = 84  ====>


5.6x = 84  ====>  x = {{{84/5.6}}} = 15.


<U>Answer</U>.  15.
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