A factory brings in a pile of coal. If it burns 1500 kg per day, it will be burned one day earlier than planned. If it burns 1000 kg per day, it will be burned one day longer than planned. How many kilograms does this pile of coal weigh?
某厂运来一堆煤，如果每天烧1500千克，比计划提前一天烧完，如果每天烧1000千克，将比计划多烧一天．这堆煤有多少千克？
<gadget id="calculator">1_500 + 1_000</gadget>
<output>2_500</output>

<gadget id="calculator">1_500 - 1_000</gadget>
<output>500</output>

<gadget id="calculator">2_500 / 500</gadget>
<output>5</output>

<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">1_500 * 4</gadget>
<output>6_000</output>

<result>6_000</result>