To pave a room with floor tiles, if you use square bricks with an area of 16 square decimeters, you will use 350 pieces; if you use square bricks with a side length of 5 decimeters, how many pieces should you use at least?
给一间房间铺上地面砖，如果用面积是16平方分米的方砖共用去350块；如果改用边长是5分米的方砖，至少要用多少块？
<gadget id="calculator">16 * 350</gadget>
<output>5_600</output>

<gadget id="calculator">5 * 5</gadget>
<output>25</output>

<gadget id="calculator">5_600 / 25</gadget>
<output>224</output>

<result>224</result>