vbox=, I assume we are dealing with l=w=h so v=lwh=12^3=1728
vsphere=(4/3)pir^3 r=3 vsphere=(4/3)pi3^3=4pi9=36pi 8 of them so 8 times 36pi=288pi or about 904.7786842338604526772412943845 cubic inches
vbox-sphere=1728-904.7786842338604526772412943845=823.2213157661395473227587056155 space filled by packing beads is about 823.22 cubic inches beads percent is 823.2213157661395473227587056155/1728 times 100=47.64% filled by beads
21 students because if 6 represents 30% u add 6 two more time which equals 18 and 90% then u add 3 more because it is half of 6. when u add 3 more u will get 21 and 100%
