Use red and green small square tiles to form a square wall. Counting from the outside to the inside, the outermost layer of the wall is red tiles, the second layer is green tiles, and the third layer is red tiles. , the fourth layer is green tiles... Lay the next layer in this way, a total of 400 tiles are used. May I ask: Which color tiles are more on this wall? How much is the difference between the two tiles?
用红、绿两种颜色的小正方形瓷砖铺成一块正方形墙面，由外到内算起，这个墙面最外层铺的是红色瓷砖，第二层是绿色瓷砖，第三层是红色瓷砖，第四层是绿色瓷砖…这样依次铺下次，一共使用了400块瓷砖．请问：这个墙面上哪种颜色的瓷砖更多？两种瓷砖相差多少块？
<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">8 * 5</gadget>
<output>40</output>

<result>40</result>