Multiple Choice Questions on A positive number when increased by 10 equals 200 times its reciprocal What is number ........ for CDS Exam Preparation

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Multiple Choice Questions

A positive number when increased by 10 equals 200 times its reciprocal What is number ........

Quantitative Aptitude (CDS) Number System
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    A positive number, when increased by 10 equals 200 times its reciprocal. What is number?

    100

    Incorrect Answer

    10

    Correct Answer

    20

    Incorrect Answer

    200

    Incorrect Answer
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    Explanation:

    Let the positive number be x
    According to the question
    x + 10 = 200 / x
    ⇒ x2 + 10x = 200
    ⇒x2  + 10x − 200 = 0
    ⇒ (x − 10) (x + 20) = 0
    x = 10, −20
    But x\neq -20  since x is a positive number
    The required number is 10.

    By: Munesh Kumari
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