If you use square bricks with a side length of 30 cm to pave a room, you need 800 yuan. If you use square bricks with a side length of 50 cm instead, how many bricks are needed? (Solve with ratio)
如果用边长30厘米的方砖给一个房间铺地，需要800块．如果改用边长50厘米的方砖铺地，需要多少块？(用比例解)
<gadget id="calculator">30 * 30 * 800</gadget>
<output>720_000</output>

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

<gadget id="calculator">720_000 / 2_500</gadget>
<output>288</output>

<result>288</result>