A unit brings in a batch of coal. If it burns 1500 kg per day, it will be burned one day earlier than the original plan; if it burns 1000 kg per day, it will take one day longer than the original plan. Now it is required to burn out according to the original plan, how many kilograms should be burned per day?
某单位运来一批煤，如果每天烧1500千克，那么比原计划提前一天烧完；如果每天烧1000千克，那么将比原计划多用一天．现在要求按原计划烧完，每天应烧多少千克？
<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>

<gadget id="calculator">6_000 / 5</gadget>
<output>1_200</output>

<result>1_200</result>