The canteen bought 25 bags of rice, 40 kilograms each, and 20 bags of flour, 30 kilograms each. How much less was the flour than the rice?
食堂买了25袋大米，每袋40千克，还买了20袋面粉，每袋30千克，买面粉比大米少多少千克？
<gadget id="calculator">25 * 40</gadget>
<output>1_000</output>

<gadget id="calculator">30 * 20</gadget>
<output>600</output>

<gadget id="calculator">1_000 - 600</gadget>
<output>400</output>

<result>400</result>