The supermarket shipped 8 bags of sugar, each bag 75 kg. After selling 4 bags, how many kilograms are left?
超市运来8袋白糖，每袋75千克．卖掉4袋后，还剩下多少千克？
<gadget id="calculator">8 - 4</gadget>
<output>4</output>

<gadget id="calculator">75 * 4</gadget>
<output>300</output>

<result>300</result>