You are packing a boxed gift in a larger shipping box. The dimensions of the shipping box are all 1.5 times the dimensions of the boxed gift. The volume of the shipping box is 1080 cubic inches. What volume of the shipping box is not taken up by the gift box?

If the dimensions of the shipping box are all 1.5 times those of the gift, then the shipping box is 1.5*1.5*1.5, or 3.375 times larger than the gift. If the shipping box is 1080 cu. in., then the gift is 1080/3.375, or 320 cu. in ... Therefore; the amount of unused space is 1080-320, or 760