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    Question

    Simplify 21 − [6 + 7 − {3.22 − (1.1 ×

    0.2)}].
    A 13 Correct Answer Incorrect Answer
    B 12 Correct Answer Incorrect Answer
    C 11 Correct Answer Incorrect Answer
    D 10 Correct Answer Incorrect Answer

    Solution

    21 − [6 + 7 − {3.22 −(1.1 × 0.2)}]  = 21 − [6 + 7 − {3.22 − 0.22}] = 21 − [6 + 7 −3.00] = 21 − [13 − 3] = 21 − 10 = 11

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