To convert ounces to tonnes divide by 35273.97. I've generated some hopefully helpful examples randomly below, as with most random sentences please excuse the repetitive and occasionally comic outcomes.
In 210 ounces of lentils there are 0.0059534 tonnes, to achieve this take 210 and just divide by 35273.97.
You have 470 ounces of flour but you need to know how many tonnes that is. To get the answer divide by 35273.97 which gives you 0.01332427 tonnes.
How many tonnes of rice are there in 220 ounces? Just divide by 35273.97 to get the answer of 0.00623689 tonnes.
To convert 60 ounces into tonnes divide by 35273.97 giving 0.00170097 tonnes.
You've got 450 ounces of salt but someone only wants to buy that in units of tonnes, to change the units divide by 35273.97. Now you have 0.01275728 tonnes.