It takes 2,000 pieces to pave a floor with square bricks with a side length of 20 cm. If the floor is paved with square bricks with a side length of 40 cm, how many pieces are needed?
用边长20厘米的方砖铺一块地，需要2000块，如果改用边长为40厘米的方砖铺地，需要多少块？
<gadget id="calculator">20 * 20 * 2_000</gadget>
<output>800_000</output>

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

<gadget id="calculator">800_000 / 1_600</gadget>
<output>500</output>

<result>500</result>