In 590 lbs of lentils there are 267.6196 kgs, to achieve this take 590 and just divide by 2.204622.

You've got 830 lbs of flour but someone only wants to buy that in units of kgs, to change the units divide by 2.204622. Now you have 376.4818 kgs.

How many kgs of butter are there in 120 lbs? Just divide by 2.204622 to get the answer of 54.43110 kgs.