Recycling 5 tons of waste paper can produce 4 tons of new paper, which is equivalent to cutting down 85 trees. Last year, a paper mill recycled 1,200 tons of waste paper, which is equivalent to cutting down how many trees.
回收5吨废纸能制造新纸4吨，相当于少砍85棵树，某造纸厂去年回收废纸1200吨相当于少砍多少棵树．
<gadget id="calculator">85 / 5</gadget>
<output>17</output>

<gadget id="calculator">17 * 1_200</gadget>
<output>20_400</output>

<result>20_400</result>