weight??
Assuming no trick to this and all the caveats, 99.5kg? Assume the old Admiralty spherical Earth and circumference is 21600 x 6080 = 131328000 feet therefore radius is 20901500 feet. Gravity is inversely proportional to square of distance. Lofty is at 20951500 feet. Do the sums (20901500^2) / (20951500^2) equals 0.995232767 sooooo allowing for the wind, Lofty weighs 99.5kg??
There's gotta be a catch to this and I've fallen for it. Go on! What's the punchline?