The grain store shipped 50 bags of flour, each weighing 25 kg. After selling 29 bags, how many kilograms are left?
粮店运来50袋面粉，每袋面粉重25千克．卖出29袋后，还剩下多少千克？
<gadget id="calculator">50 - 29</gadget>
<output>21</output>

<gadget id="calculator">21 * 25</gadget>
<output>525</output>

<result>525</result>