When one arm of a U-tube manometer is connected to a gas supply, the levels of mercury in the two arms of the U-tube is shown in the figure above, if the atmospheric pressure is 76.0cm hg, the gas pressure is
A.
62.6cm hg
B.
72.5cm hg
C.
79.5cm hg
D.
85.9cm hg
Correct answer is D
No explanation has been provided for this answer.