Concrete quantity

[BQW]

I need to concrete a area slightly less the 4 sq meters, to a depth of about 75mm, I belive it works out about 0.3 cu mtrs of mixed concrete.
For reasons of logistics it is easier if I buy the ballast in in 25Kg bags, how many bags would I need ? Thanks

 

[Ian H]

24 bags, 6per meter?

 

[noseall]

24 bags, 6per meter?

....and 4 bags of dust.

 

[Ian H]

....and 4 bags of dust.

For lunch?