There used to be some flour in the store, each bag was 25 kilograms. After selling 7 bags, there were 350 kilograms left. How many kilograms of flour did the store have? (Solution of column equation)
商店原来有一些面粉，每袋25千克，已卖出7袋后，还剩350千克，这个商店原来有面粉多少千克？(列方程解)
<gadget id="calculator">25 * 7</gadget>
<output>175</output>

<gadget id="calculator">175 + 350</gadget>
<output>525</output>

<result>525</result>