Find the side length of the square base of a milk box

Question

A milk box has a height 5 inches greater than the length of each side of its square base. If the box has a volume of 72 cubic inches, what is the side length of the square base?

Answer 1

V =hlw = hb^2 = 72 = 5b^2

b^2 = 72/5= 14.4

b = sqr(14.4) = about 3.8 inches = a side of the square bottom of the box

V=5(72/5) = 72 cubic inches