It takes 1,200 pieces to pave the classroom with square bricks with a side length of 20 cm. If the floor is paved with square bricks with a side length of 50 cm, how many pieces are needed? (Answer with proportional knowledge)
用边长是20厘米的方砖给教室铺地，需要1200块，如果改用边长是50厘米的方砖铺地，需要多少块？(用比例知识解答)
<gadget id="calculator">20 * 20 * 1_200</gadget>
<output>480_000</output>

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

<gadget id="calculator">480_000 / 2_500</gadget>
<output>192</output>

<result>192</result>