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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-15

  • question_answer
    If the sum of two positive numbers is 25 and their product is 144, then the difference of these numbers is

    A)  3                    

    B)  5

    C)  7                    

    D)  11

    Correct Answer: C

    Solution :

    Let two positive numbers are x and y. \[x+25\] \[xy=144\] \[\therefore \] \[x-y=\sqrt{{{(x+y)}^{2}}-4xy}\] \[=\sqrt{{{(25)}^{2}}-4\times 144}\] \[\,=\sqrt{625-576}\] \[=\sqrt{49}=7\]


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