各位高人，求题解。

hughhu

1、a square countertop has a square 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 follwing could be the width, in inches, of the strip?

a;1

b:3

c:4

key a b c 都是。

我画图看了，但是没搞懂怎么会有4呢？

2、Jerome wrote each of the intergers 1 through 20,inclusive,on a separate index card, he placed the cards in a box, then drew cards one at a time randomly from the box, whithout returning the cards he had already drawn to the box . in order to ensure that the sum of all the cards he drew was even , how many cards did Jerome have to draw?

key 12

根本没有思路，郁闷阿！

hughhu

没人会么？等待中。