It takes 2,000 pieces to pave the floor of a classroom with square bricks with a side length of 15 cm; how many pieces are needed if the square bricks with a side length of 25 cm are used instead?
用边长是15厘米的方砖铺一个教室的地面，需要2000块；如果改用边长是25厘米的方砖来铺，需要多少块？
<gadget id="calculator">15 * 15 * 2_000</gadget>
<output>450_000</output>

<gadget id="calculator">25 * 25</gadget>
<output>625</output>

<gadget id="calculator">450_000 / 625</gadget>
<output>720</output>

<result>720</result>