The school cafeteria brings in 20 bags of rice, each bag of 90 kilograms of rice, and 500 kilograms of flour. How many kilograms more rice is shipped than flour?
学校食堂运进大米20袋，每袋大米90千克，运进面粉500千克．运进的大米比面粉多多少千克？
<gadget id="calculator">90 * 20</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 - 500</gadget>
<output>1_300</output>

<result>1_300</result>