The average age of $x$ and $y$ is $20$ $years.$ If $z$ were to replace $x,$ the average would be $19$ and if $z$ were to replace $y$, the average would be $21.$ Find the ages of $x, y$ and $z$.

  • A

    $22,18,20$

  • B

    $18,22,20$

  • C

    $22,18,20$

  • D

    $18,20,22$

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