3 vehicles transported coal at the same time, a total of 18 tons were transported twice, how many kilograms of coal was transported by each vehicle each time.
3辆汽车同时运煤，两次一共运了18吨，每辆车每次运送煤多少千克．
<gadget id="calculator">18 / 2 / 3</gadget>
<output>3</output>

<gadget id="calculator">3 * 1_000</gadget>
<output>3_000</output>

<result>3_000</result>