Average age of $5$ boys is $16$ $year$ of which that of $4$ boys is $16\, year\, 3\, months.$ The age of the $5^{th}$ boy is

  • A

    $15\, year$

  • B

    $15\, year$ $6\, months$

  • C

    $15\, year$ $4\, months$

  • D

    $15\, year$ $2\, months$

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