It takes 600 pieces to pave the classroom with square bricks with a side length of 30 cm. Now, how many square bricks are needed for paving with square bricks with a side length of 50 cm? (answer with ratio)
用边长为30厘米的方砖给教室铺地，需要600块；现在改用边长为50厘米的方砖铺，需要多少块方砖？(用比例解答)
<gadget id="calculator">30 * 30 * 600</gadget>
<output>540_000</output>

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

<gadget id="calculator">540_000 / 2_500</gadget>
<output>216</output>

<result>216</result>