21.9355
Density equals mass divided by volume. so 68 cm3 / 31 g = 2.2 g/cm3 would be the answer...2.2 g/cm3
68-31 = 37
3
68 divided by9 = 7.555555555555555
503 divided 68 = 7.397058823529412
68 divided by 3 is 22.67
68
0.68
0.0769
7
68 divided 4 = 17
0.0029