If $\frac{5}{m}+\frac{2}{n}=9$ and $\frac{3}{m}+\frac{4}{n}=11$ and $mn \neq 0$,then the values of $m$ and $n$ are . . . . . . respectively.

  • A
    $1$ and $-\frac{1}{2}$
  • B
    $-1$ and $\frac{1}{2}$
  • C
    $1$ and $\frac{1}{2}$
  • D
    $-1$ and $-\frac{1}{2}$

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