A small truck can transport 2,500 kg of coal, a large truck can transport 500 kg more than three times that of a small truck each time, a large truck and a small truck can transport 3 times each, how many kilograms of coal can be transported in total.
一辆小卡车可以运煤2500千克，一辆大卡车运的每次是小卡车的3倍还多500千克，一辆大卡车和一辆小卡车各运3次，一共可以运煤多少千克．
<gadget id="calculator">2_500 * 3</gadget>
<output>7_500</output>

<gadget id="calculator">7_500 + 500</gadget>
<output>8_000</output>

<gadget id="calculator">2_500 + 8_000</gadget>
<output>10_500</output>

<gadget id="calculator">10_500 * 3</gadget>
<output>31_500</output>

<result>31_500</result>