The transport team has to transport 250 tons of goods. It has been transported for 5 days, 30 tons per day, and the remaining 20 tons per day. How many days will it take to finish the shipment?
运输队要运250吨货物，已经运了5天，每天运30吨，剩下的每天多运20吨，还要几天可以运完？
<gadget id="calculator">30 * 5</gadget>
<output>150</output>

<gadget id="calculator">250 - 150</gadget>
<output>100</output>

<gadget id="calculator">30 + 20</gadget>
<output>50</output>

<gadget id="calculator">100 / 50</gadget>
<output>2</output>

<result>2</result>