strength  cement
38.4 	  16.6
75.8 	  16.6
40.0 	  15.3
38.0 	  17.1
60.3 	  20.7
70.0 	  20.8
63.6 	  17.2
59.8 	  16.6
71.0 	  20.9
70.6 	  20.0
48.8 	  15.3
29.3 	  16.6
40.5 	  15.3
48.8 	  15.3
35.8 	  16.8
56.8 	  17.3
37.2 	  16.0
48.8 	  16.3
52.0 	  15.5
50.1 	  15.7
74.6 	  17.1
73.6 	  18.1
43.8 	  18.8
60.4 	  16.6