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    4. No. System
    5. A number is doubled and 9 is added. If the resultant is tripled, it becomes 81. What is that number?

    Question

    A number is doubled and 9 is added. If the resultant is

    tripled, it becomes 81. What is that number?
    A 1 Correct Answer Incorrect Answer
    B 7 Correct Answer Incorrect Answer
    C 9 Correct Answer Incorrect Answer
    D 6 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the number be x According to question 3(2x + 9) = 81 2x + 9 = 27 2x = 18 x = 9

    Practice Next
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