There is no way to answer that without knowing how deep the concrete will be.
1 cubic metre of m25 concrete = 2 400 kg, so 2 400 / 50 = 48 bags
That would depend on regulations in Australia. Contact a local freight forwarder for detailed information.
One bag would cover 250 square feet to a depth of 1/125 = 0.008 feet = 0.96 inches.
27
Plastic bags are cheaper and I do believe, easier to make as compared to paper bags.
27 bags of 30kg bags of concrete bargs
Forty five 80 pound bags of cement are needed to make one cubic yard of concrete.
25
Depending on the use of the concrete, between 5-6 bags.
You can't estimate that without having a thickness. You have to be able to have an actual volume of space you want to fill up with concrete.
According to the related link below; the required amount to cover 1 square yard with 4 inches of concrete is 6.6 60 pounds bags.
it takes about 15. my dad does it.
go to any search. and type in concrete calculater
about 60 60lb bags
20
typically one pallet, i believe theres 42 80lb bags on a pallet.
It depends on the usage of the concrete. For footings, you would need 5 bags of cement. For sidewalks, etc. you would need 6 bags. Generally, if you know the usage it's for, you can contact a local ready-mix plant and they can tell you exactly.