The grain store shipped 4 carts of flour, each with 75 bags. 150 bags are sold, how many bags are left?
粮店运来4车面粉，每车75袋．卖出150袋，还剩多少袋？
<gadget id="calculator">75 * 4</gadget>
<output>300</output>

<gadget id="calculator">300 - 150</gadget>
<output>150</output>

<result>150</result>