The ratio of minimum compressive strength on 15 cm cubes prepared with the concrete of M 20 grade and M 40 grade, at 7 days should be at least
A.	1/3
B.	1/2
C.	3/2
D.	2.0
Answer:B
The ratio of minimum compressive strength on 15 cm cubes prepared with the concrete of M 20 grade and M 40 grade, at 7 days should be at least
A.	1/3 B.	1/2 C.	3/2 D.	2.0