If a classroom is paved with square floor tiles with an area of 0.3 square meters, 480 pieces are needed. If the floor is paved with square floor tiles with a side length of 0.4 meters, how many pieces are needed in total?
一间教室，如果用面积0.3平方米的正方形地砖铺地需要480块，如果改用边长0.4米的正方形地砖铺地，一共需要多少块？
<gadget id="calculator">0.3 * 0.3</gadget>
<output>0.09</output>

<gadget id="calculator">0.4 * 0.4</gadget>
<output>0.16</output>

<gadget id="calculator">480 / 0.16</gadget>
<output>3_000</output>

<gadget id="calculator">0.09 * 3_000</gadget>
<output>270</output>

<result>270</result>