The atomic weights of two elements $A$ and $B$ are $40$ and $80$ respectively. If $x \ g$ of $A$ contains $y$ atoms,how many atoms are present in $2x \ g$ of $B$?

  • A
    $y/2$
  • B
    $y/4$
  • C
    $y$
  • D
    $2y$

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