The school bought 5 bags of flour and 2 bags of sugar, weighing 490kg in total. It is known that each bag of white sugar weighs 45kg, how many kilograms does each bag of flour weigh? (column equation solution)
学校买了5袋面粉和2袋白糖，一共重490kg．已知每袋白糖重45kg，每袋面粉重多少千克？(列方程解答)
<gadget id="calculator">45 * 2</gadget>
<output>90</output>

<gadget id="calculator">490 - 90</gadget>
<output>400</output>

<gadget id="calculator">400 / 5</gadget>
<output>80</output>

<result>80</result>