At the top of a mountain a thermometer reads $7°C$ and a barometer reads $70\, cm$ of $Hg.$ At the bottom of the mountain these read $27°C$ and $76 \,cm$ of $Hg$ respectively. Comparison of density of air at the top with that of bottom is
  • A$75/76$
  • B$70/76$
  • C$76/75$
  • D$76/70$
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