For a batch of goods, 100 tons were transported on the first day, and 155 tons were transported on the second day, and 15% of the goods were not transported. How many tons are there in this batch?
一批货物，第一天运走100吨，第二天运走155吨，还剩下这批货物的15%没有运走，这批货物有多少吨？
<gadget id="calculator">100 + 155</gadget>
<output>255</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">255 / (17/20)</gadget>
<output>300</output>

<result>300</result>