If a house needs to be paved with square bricks, 1,750 square bricks with a side length of 20 cm are used; how many square bricks with a side length of 50 cm are used for paving?
一间房子要用方砖铺地，用边长20厘米的方砖铺成1750块；若用边长50厘米的方砖来铺需要多少块？
<gadget id="calculator">20 * 20 * 1_750</gadget>
<output>700_000</output>

<gadget id="calculator">50 * 50</gadget>
<output>2_500</output>

<gadget id="calculator">700_000 / 2_500</gadget>
<output>280</output>

<result>280</result>