The grain store shipped 50 bags of rice and 40 bags of flour, each bag of rice was 25 kg, and each bag of flour was 20 kg. How many kilograms more rice was shipped than flour?
粮店运来50袋大米和40袋面粉，每袋大米25千克，每袋面粉20千克．运来的大米比面粉多多少千克？
<gadget id="calculator">25 * 50</gadget>
<output>1_250</output>

<gadget id="calculator">20 * 40</gadget>
<output>800</output>

<gadget id="calculator">1_250 - 800</gadget>
<output>450</output>

<result>450</result>