If at the top of a hill 50 m high the barometer showed 758 mm Hg. Art., then what will be the atmospheric pressure at the foot?

Atmospheric pressure decreases with altitude, while ascending by 1000 m atmospheric pressure decreases by 100 mm (100 m – 10 mm). Hence it follows that if at the top of a hill 50 m high the barometer showed 758 mm Hg. Art., then at the foot of the hill the atmospheric pressure will increase and will be equal to 763 mm Hg. Art.

100 m – 10 mm
50 m – x mm
x = 50 x 10/100
x = 5 mm
758 + 5 = 763 mm