hi,how do you turn cubic metre of mortar into tonne bags of sand and cement?

Hi one cubic metre of mortar would convert in to two tonne bags of soft sand and ten bags of cement, halfe a cubic metre = 1 tonne ,1 m3 = 2 tonne , 2 m3 = 4 tonne ,allow 4-5 bags of cement per tonne bag to give you a ratio of 4 sand to 1 cement .