800 kg of recycled paper can be produced from 1 ton of recycled waste paper, which can save about 17 large trees from being felled. If 600 students in the third grade recycle 5 kilograms of waste paper per month, how many big trees can be saved from being felled?
用1吨的回收废纸能生产再生纸800千克，大约能让17棵大树免受砍伐．如果三年级600名同学每人每月回收5千克废纸，那么可以让多少棵大树免受砍伐？
<gadget id="calculator">5 / 1_000</gadget>
<output>1/200 = around 0.005</output>

<gadget id="calculator">600 * (1/200) * 17</gadget>
<output>51</output>

<result>51</result>