The following utility will enable you to convert mass/weight expressed in ounces to kilograms
To convert ounces to kilograms divide by 35.27397
You've got 950 ounces of sugar but someone only wants to buy that in units of kilograms, to change the units divide by 35.27397. Now you have 26.93204 kilograms.
To convert 510 ounces into kilograms divide by 35.27397 giving 14.45825 kilograms.
You have 630 ounces of pasta but you need to know how many kilograms that is. To get the answer divide by 35.27397 which gives you 17.86020 kilograms.