Multiple Choice Questions on Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the n........... for Logical Reasoning ( All Exams ) Preparation

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Multiple Choice Questions

Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the n...........

Logical Reasoning(Master ) Arithmetical Reasoning
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    Thrice the square of a natural number decreased by 4 times the number is equal to 50 more than the number. The number is  ?

    5

    Correct Answer

    4

    Incorrect Answer

    7

    Incorrect Answer

    6

    Incorrect Answer
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    Explanation:

    Let the number be x. Then,

    3x2 - 4x = x + 50

    3x2 - 5x - 50 = 0

    (3x + 10)(x - 5) = 0

    x = 5

    Hence, option 1 is the correct answer.

    By: Amit Kumar
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