Determine the atmospheric pressure at the top of the mountain if the pressure at its foot is 740 mm

Determine the atmospheric pressure at the top of the mountain if the pressure at its foot is 740 mm, and the height of the mountain is 3150 m.

We know that the mountain is 3150 m high, and its pressure from below is equal to 740 millimeters of mercury. We also know that the pressure decreases by 1 millimeter every 10 meters. In order to find the pressure level at the top (summit), we divide the height of the mountain by 10 meters, we get 315. The pressure will drop by so many millimeters of mercury when climbing up the mountain. Now we will calculate exactly what it will be at the top: 740-315 = 425 millimeters of mercury.
Answer: 425 mm Hg.