A school bus is roughly 6 ft by 30 ft by 6ft which is a volume of 1000 cubic ft. subtract the volume of the seats which is roughly 100 cubic ft leaves 900 cubic ft of space for golfballs. a golfballs volume is estimated to 4/3 pi r cubed, with a radius being 1.25 inch thus equal to 4/3 * 3.14 * (1.25)^3 ~~ roughly 2 cubic inches which is 1/1000 ISH cubic feet. thus 900 000 golf balls ill roughly fit into a school bus.