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    Question

    If 20% of a number is added to 120, then the result is

    the same number. 80% of the same number is: 
    A 240 Correct Answer Incorrect Answer
    B 120 Correct Answer Incorrect Answer
    C 140 Correct Answer Incorrect Answer
    D 180 Correct Answer Incorrect Answer

    Solution

    Let the number be x 20% of x = 0.2x ATQ: 0.2x + 120 = x x − 0.2x = 120 0.8x = 120 x = 120 / 0.8 = 150 80% of x = 0.8 × 150 = 120

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