It's a trick question relying on your preconception that feathers are lighter. They of course weigh the same a kg of versus a kg of. Of course it will take a heck of lot more feathers.
Feathers are soft and will not injure anyone, stones will.
As long as they're both on the same planet, every kilogram weighs the same. Put 1 kg of stones and 1 kg of feathers (or 1 kg of smoke or 1 kg of water or 1kg of dust) on opposite ends of a see-saw, and they balance.
215kg is 33.8567 stones.
13.88912 stones
8.66 stones
Neither!!! They both have the same mass at 1 kg. However, the feathers will occupy a greater volume.
They both weigh a kilogram.
5 kg = 0.79 stones
7.9523887 stones in 50.5 kilograms
42.1841 kg
What is 72 kg Converted to Stones
79 kg = about 12.44 stones.