The factory has 8,000 kilograms of coal. It was originally planned to burn for 25 days. Due to the improvement of the stove, it actually burned for 32 days. How many kilograms are saved per day on average compared with the original plan?
工厂有煤8000千克，原计划烧25天，由于改进炉灶，实际烧了32天，平均每天比原计划节约多少千克？
<gadget id="calculator">8_000 / 25</gadget>
<output>320</output>

<gadget id="calculator">8_000 / 32</gadget>
<output>250</output>

<gadget id="calculator">320 - 250</gadget>
<output>70</output>

<result>70</result>