For the same pile of goods, vehicle A needs to be transported 10 times, and vehicle B needs to be transported 15 times; it is known that the load of vehicle A is 3 tons less than twice that of vehicle B. How many tons is this pile of goods?
同一堆货物，甲车要运10次，乙车要运15次；已知甲车的载重量比乙车的2倍少3吨．这堆货物共有多少吨？
<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<gadget id="calculator">15 * 6</gadget>
<output>90</output>

<result>90</result>