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  1. The sum of two number is 25 and their difference is 13. Find their product.

    2. A.

    104
    B.

    114
    C.

    315
    D.

    325

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    Answer : Option B

    Explanation :

    Let the numbers be x and y.

     

    Then, x + y = 25 and x - y = 13.

     

    4xy = (x + y)2 - (x- y)2

     

         = (25)2 - (13)2

     

         = (625 - 169)

     

        = 456

     

     xy = 114.

     

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