There are some bags of rice in the warehouse of the factory, weighing 300 kg in total. Each bag of rice weighs a kg. After transporting 8 bags, how many kg are left.
厂库里有一些袋装大米，共重300千克，每袋大米重a千克，运走8袋后，还剩下多少千克．
<gadget id="calculator">300 - 8</gadget>
<output>292</output>

<result>292</result>