Teacher Zhang was going to lay 900 square centimeters of floor tiles on the floor of the study, and just used 200. If all the floor tiles with an area of 600 square centimeters are re-paved, how many tiles are needed?
张老师准备在书房的地面上铺每块面积是900平方厘米的地砖，刚好用了200块．如果全部改铺每块面积是600平方厘米的地砖，需要多少块？
<gadget id="calculator">900 * 200</gadget>
<output>180_000</output>

<gadget id="calculator">180_000 / 600</gadget>
<output>300</output>

<result>300</result>