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Discussion :: Problems on Numbers

  1. The sum and difference of two numbers are 25 and 10 respectively. Find the difference of their squares.

  2. A.
    190
    B.
    200
    C.
    210
    D.
    220

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    Answer : Option B

    Explanation :

    Let the numbers be x and y.
    As per the question: x + y = 25 and x - y = 8
    So, x2 - y2 = (x + y) (x - y)
    = 25 * 8 = 200


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