The store shipped 300 bags of chemical fertilizer, each bag was 50 kilograms, and sold 120 bags, how many kilograms are left?
商店运来化肥300袋，每袋50千克，卖出120袋，还剩多少千克？
<gadget id="calculator">300 - 120</gadget>
<output>180</output>

<gadget id="calculator">180 * 50</gadget>
<output>9_000</output>

<result>9_000</result>