If a classroom is paved with square bricks with a side length of 30 cm, 320 pieces are needed; if the floor is paved with square bricks with a side length of 40 cm, how many pieces are needed? (Answer with the knowledge of proportion)
一间教室，如果用边长是30厘米的方砖铺地，需要320块；如果改用边长40厘米的方砖铺地，则需要多少块？(用比例的知识解答)
<gadget id="calculator">30 * 30 * 320</gadget>
<output>288_000</output>

<gadget id="calculator">40 * 40</gadget>
<output>1_600</output>

<gadget id="calculator">288_000 / 1_600</gadget>
<output>180</output>

<result>180</result>