To pave a classroom, it takes 300 square bricks with an area of 0.16 square meters. If the floor is paved with rectangular bricks with a length of 0.4 meters and a width of 0.3 meters, how many bricks will be used? (Solve with ratio)
给一间教室铺地，用面积是0.16平方米的方砖要300块，如果改用长0.4米、宽0.3米的长方砖铺地，要用多少块？(用比例解)
<gadget id="calculator">0.16 * 300</gadget>
<output>48</output>

<gadget id="calculator">0.4 * 0.3</gadget>
<output>0.12</output>

<gadget id="calculator">48 / 0.12</gadget>
<output>400</output>

<result>400</result>