If square bricks are used to pave the floor, each brick is 0.4 meters long, 1200 pieces are needed. If the square bricks are used instead, how many bricks are needed? (Solve with ratio)
用方砖铺地，每块砖边长0.4米，需要1200块，若改用每块边长0.8米砖，需要多少块？(用比例解)
<gadget id="calculator">1_200 * 0.4 * 0.4</gadget>
<output>192</output>

<gadget id="calculator">0.8 * 0.8</gadget>
<output>0.64</output>

<gadget id="calculator">192 / 0.64</gadget>
<output>300</output>

<result>300</result>