The school cafeteria shipped 3,000 kilograms of rice. The plan was to eat it for 20 days, but the actual meal was 25 days. How much less than the original plan was the actual meal?
学校食堂运来大米3000千克，计划吃20天，实际吃了25天，实际每天比原计划少吃多少千克？
<gadget id="calculator">3_000 / 20</gadget>
<output>150</output>

<gadget id="calculator">3_000 / 25</gadget>
<output>120</output>

<gadget id="calculator">150 - 120</gadget>
<output>30</output>

<result>30</result>