An instrument room is 4.8 meters long and 3.6 meters wide. If square tiles with a side length of 0.15 meters are used to pave the floor, 768 pieces are needed. If square tiles with a side length of 0.2 meters are used instead, how many tiles are needed? (Solve with ratio)
一间仪器室长4.8米，宽3.6米，假如用边长0.15米的正方形瓷砖铺地面，需要768块，如果改铺边长0.2米的正方形瓷砖，需要用多少块？(用比例解)
<gadget id="calculator">0.15 * 0.15 * 768</gadget>
<output>17.28</output>

<gadget id="calculator">0.2 * 0.2</gadget>
<output>0.04</output>

<gadget id="calculator">17.28 / 0.04</gadget>
<output>432</output>

<result>432</result>