The floor of a room is 4 meters long and 3 meters wide. If the floor of the room is covered with square bricks with a side length of 20 cm. At least how many such square bricks are needed?
一个房间地面长4米，宽3米，如果用边长20厘米的方砖铺满整个房间地面．至少需要多少块这样的方砖？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/5) * (1/5)</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">12 / (1/25)</gadget>
<output>300</output>

<result>300</result>