Target mean strength f c k = 20 fck​=20 MPa, water/cement ratio = 0.5, water content = 200 kg/m³. Find cement content.

 Target mean strength 

$f_{ck} = 20$ MPa, water/cement ratio = 0.5, water content = 200 kg/m³. Find cement content.

Solution:

$$Cement = \frac{Water}{w/c} = 200/0.5 = 400 \text{ kg/m³}$$

Answer: 400 kg/m³