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    Question

    The weights of 4 cartons are 20, 60, 70 and 90

    kilograms. Which of the following cannot be the total weight in kilograms of any combination of these cartons and a carton can be used at most once in a combination?
    A 150 Correct Answer Incorrect Answer
    B 200 Correct Answer Incorrect Answer
    C 110 Correct Answer Incorrect Answer
    D 160 Correct Answer Incorrect Answer

    Solution

    20 + 60 + 70 = 150 20 + 90 = 110 70 + 90 = 160 200 is not possible.

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