There is a batch of goods, 30% of which was transported in the morning, and 5 tons more than the rest (2/7) in the afternoon, and finally 15 tons were left unfinished. How many tons of these goods are there in total?
有一批货物，上午运走30%，下午运走的比余下的(2/7)多5吨，最后还剩下15吨没有运完，这些货物共有多少吨？
<gadget id="calculator">1 - 0.2 - 0.3</gadget>
<output>0.5</output>

<gadget id="calculator">20 / 0.5</gadget>
<output>40</output>

<result>40</result>