A pyramid with a rectangular base has a volume of 480 cubic inches and a height of 10 inches. The width of the rectangular base is 9 inches. Find the length of the rectangular base.

We have the formula of the volume: 480 = area rectangular base x 10 / 3;

Then, 480 x 3 = area reactangular base x 10;

Area rectangular base = 480 x 3 / 10;

10 x (9 x length) = 480 x 3;

90 x width = 1440;

length = 1440/90;

length = 16 inches;