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SSC Sample Paper SSC (Group-C) Sample Test Paper-8

  • question_answer
    If \[7x-5y=20\]and \[12x+5y=75;\]what is the value of xy?

    A)  18                  

    B)  20

    C)  30               

    D)       15

    Correct Answer: D

    Solution :

     \[\frac{\begin{align}   & 7x-5y=20 \\  & 12x+5y=75 \\ \end{align}}{19x\,\,\,\,\,\,\,\,\,\,\,\,=92}\] \[\therefore \]     \[x=\frac{95}{19}=5\] Now, \[7x-5y=20\] \[\Rightarrow \]   \[7\times 5-5y=20\] \[\Rightarrow \]    \[5y=35-20=15\] \[\therefore \]   \[y=\frac{15}{5}=3\] \[x\,y=5\times 3=15\]


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