The average age of students of a class is $15.8$ $years.$ The average age of boys in the class is $16.4\, years$ and that of the girls is $15.4 \,years.$ The ratio of the number of boys to the number of girls in the class is

  • A

    $1: 2$

  • B

    $2: 3$

  • C

    $3: 4$

  • D

    $3: 5$

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