To convert 340 lbs into tons divide by 2204.622 giving 0.15422145 tons.
You have 270 lbs of butter but you need to know how many tons that is. To get the answer divide by 2204.622 which gives you 0.12246997 tons.
You've got 910 lbs of flour but someone only wants to buy that in units of tons, to change the units divide by 2204.622. Now you have 0.41276917 tons.
In 910 lbs of lentils there are 0.41276917 tons, to achieve this take 910 and just divide by 2204.622.
How many tons of salt are there in 0 lbs? Just divide by 2204.622 to get the answer of 0 tons.