It takes 2,000 pieces to pave the classroom with square bricks with a side length of 30 cm; if the floor is paved with square bricks with a side length of 40 cm, how many pieces are needed?
用边长30厘米的方砖给教室铺地，需要2000块；如果改用边长40厘米的方砖铺地，需要多少块？
<gadget id="calculator">30 * 30 * 2_000</gadget>
<output>1_800_000</output>

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

<gadget id="calculator">1_800_000 / 1_600</gadget>
<output>1_125</output>

<result>1_125</result>