Can anyone teach me how to calculate how many cement to use?

1 metre square plastering = how many cement bag?

1 metre square brickwall (mortar) = how many cement bag?

1 metre cubic concrete N15 = how many cement bag?

1 metre cubic concrete N20 = how many cement bag?

1 metre cubic concrete N25 = how many cement bag?

Density of dry sand, 3/4'' aggregates and cement = how many kg/m3?

Thank you so much!

1 metre square plastering = how many cement bag?

1 metre square brickwall (mortar) = how many cement bag?

1 metre cubic concrete N15 = how many cement bag?

1 metre cubic concrete N20 = how many cement bag?

1 metre cubic concrete N25 = how many cement bag?

Density of dry sand, 3/4'' aggregates and cement = how many kg/m3?

Thank you so much!

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