The grain store shipped back 9,090 kilograms of rice. After selling 90 bags, there was 6,390 kilograms of rice left. How much does each bag of rice weigh?
粮店运回9090千克大米，卖出90袋之后，还剩大米6390千克，问每袋大米重多少千克？
<gadget id="calculator">9_090 - 6_390</gadget>
<output>2_700</output>

<gadget id="calculator">2_700 / 90</gadget>
<output>30</output>

<result>30</result>