Question

有没有人能解答这道GMAT数学题

A square counter top has a square tile tile inlay in the center, leaving an untiled strip of uniform width around the tile. If the ratio of the tiled area to the untiled area is 25 to 39, which of the following could be the width, in inches, of the strip?
答案是1,3,4都可以

Answer 1

这个你画图出来做，设square tile边长X，countertop边长为Y，tiled suquare,与untiled square 面积比是25比39，很容易得到X/Y=5/8，这里没有对边长有限定条件，所以X可以取任意值，即1,3,4都可以~