10. The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is
A. 30 N/mm2
B. 25 N/mm2
C. 20 N/mm2
D. 15 N/mm2
10. The concrete mix of grade M 25 means that the compressive strength of 15 cm cubes at 28 days after mixing is
A. 30 N/mm2
B. 25 N/mm2
C. 20 N/mm2
D. 15 N/mm2