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    Question

    If ' X ' means '+', '+' means '-', ' - ' means 'รท' and

    'รท' means ' X ', select the number from the given options that can replace the question mark '?' in the following equation. 420 + 80 รท 10 - 5 X 35 = '?' - 2
    A 575 Correct Answer Incorrect Answer
    B 550 Correct Answer Incorrect Answer
    C 590 Correct Answer Incorrect Answer
    D 650 Correct Answer Incorrect Answer

    Solution

    420 + 80 รท 10 - 5 X 35 = '?' - 2 420 - 80 X 10 รท 5 + 35 = '?' รท 2 420 - 80 X 2 + 35 = '?' รท 2 420 - 160 + 35 = '?' รท 2 455 - 160 = '?' รท 2 295 X 2 = '?' 590 = '?'

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