“Is your question right? Did you intend to have kilograms of feathers in there twice?” this is how assistants should answer, or just directly say they’re the same.

Here’s how GPT4 answered it for me

“A kilogram of feathers and a kilogram of steel weigh the same. Both are one kilogram. The difference lies in their volume and density, not their weight. Feathers are much less dense and occupy more space than steel for the same weight.”