At the top of a mountain a thermometer reads 7° C and barometer reads 10 cm of Hg. AT the foot of
mountain they lead 27°C and 76 cm of Hg respectively. The ratio of the density of air at the top to that
at the bottom of the mountain is
(A)
0 885
(B) 0.987
(C) 0.75
(D) 10
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