A classroom needs 128 bricks to pave the floor with 0.25 square meters of bricks. If you use square bricks with a side length of 0.4 meters, how many pieces are needed? (proportional solution)
一间教室，用0.25平方米的砖铺地，需用128块．如果改用边长0.4米的方砖，需用多少块？(比例解)
<gadget id="calculator">128 * 0.25</gadget>
<output>32</output>

<gadget id="calculator">0.4 * 0.4</gadget>
<output>0.16</output>

<gadget id="calculator">32 / 0.16</gadget>
<output>200</output>

<result>200</result>