A certain car transportation company transports a batch of goods. If each vehicle transports 3 tons more, 50 vehicles can be transported. If each vehicle transports 1 ton less, 60 vehicles can be transported. Under normal circumstances, each vehicle transports How many tons of cargo?
某种汽车运输公司运输一批货物，如果每辆车多运3吨，50辆车可以运完，如果每辆车少运1吨，60辆车可以运完，正常情况下，每辆车运输货物多少吨？
<gadget id="calculator">3 * 50</gadget>
<output>150</output>

<gadget id="calculator">150 + 60</gadget>
<output>210</output>

<gadget id="calculator">60 - 50</gadget>
<output>10</output>

<gadget id="calculator">210 / 10</gadget>
<output>21</output>

<result>21</result>