If a practice room is paved with square bricks with a side length of 0.4 meters, 1,200 pieces are needed. If the square bricks with a side length of 0.5 meters are used instead, how many pieces are needed?
一个练功房用边长0.4米的方砖铺地，需要1200块，如果改用边长是0.5米的方砖，需要多少块．
<gadget id="calculator">0.4 * 0.4 * 1_200</gadget>
<output>192</output>

<gadget id="calculator">0.5 * 0.5</gadget>
<output>0.25</output>

<gadget id="calculator">192 / 0.25</gadget>
<output>768</output>

<result>768</result>