Multiple Choice Questions on Find the sum of two consecutive even numbers whose difference of squares is 84 ........ for CDS Exam Preparation

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Multiple Choice Questions

Find the sum of two consecutive even numbers whose difference of squares is 84 ........

Quantitative Aptitude (CDS) Number System
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    Find the sum of two consecutive even numbers whose difference of squares is 84.

    67

    Incorrect Answer

    48

    Incorrect Answer

    42

    Correct Answer

    30

    Incorrect Answer
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    Explanation:

    Let two consecutive even numbers are x and (x+2).

    Now, (x+2)^2 - x^2 =84

            x^2+4x+4-x^2=84

            4x=84-4

            x=80/4 =20

    Two numbers are 20 and 22.

    The sum of two consecutive even numbers

      =20+22=42.

    By: bhavesh kumar singh
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