Five years ago, the average age of $P$ and $Q$ was $15 \,year.$ Now, average age of $P , Q$ and $R$ is $20 \,year.$ What whould be the age of $R$ after $10$ $year$ in $year$ ?

  • A

    $35$

  • B

    $40$

  • C

    $30$

  • D

    $50$

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