At the top of a mountain a thermometer r...

At the top of a mountain a thermometer read `7^(@)C` and barometer reads 70cm of Hg. At the bottom of the mountain the barometer reads 76cm of Hg and thermometer reads `27^(@)C`. The density of air at the top of the mountain is ___ times the density at the bottom.

0.99

0.9

0.89

0.95

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