There is an iron kettle-bell which weighs 6 kilograms, an infinite amount of sugar, infinite amount of packets for it and a weighing scale which has two weighing pans.
The scales are in equilibrium if the ratio of masses on the first to the second cup is 3:4. You are allowed to put any weight you have on the scales. You can also add a packet of measured sugar to one of the cups which will let the scales come to an equilibrium. The packets with weighed sugar may be used in the next weighings.
Is it possible to measure 1 kilogram of sugar?