The sixth grade classroom now needs to lay floor tiles, and 300 bricks are needed for each 6 decimeter square brick. If it is changed to use 9 square decimeter square bricks, how many bricks are needed? (Solve with ratio)
六年级教室现需要铺设地板砖，用每块6平方分米的方砖需要300块，如果改成用每块9平方分米的方砖，需要多少块？(用比例解)
<gadget id="calculator">6 * 300</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 / 9</gadget>
<output>200</output>

<result>200</result>