so how do i solve for an aluminum density if my numbers are -

40.3 and 105.29
4.8 and 18.199
5.1 and 23.22
3.5 and 15.087
9.6 and 89.31

40.3 what? and 105.29 what?

density = mass/volume.
mass usually in grams and volume usually in cc or cm^3 or mL