The grain store shipped 30 bags of rice and 40 bags of flour, a total of 2,500 kilograms, and each bag of rice was 50 kilograms. How many kilograms of flour per bag?
粮店运来30袋大米和40袋面粉，一共是2500千克，大米每袋50千克．每袋面粉多少千克？
<gadget id="calculator">50 * 30</gadget>
<output>1_500</output>

<gadget id="calculator">2_500 - 1_500</gadget>
<output>1_000</output>

<gadget id="calculator">1_000 / 40</gadget>
<output>25</output>

<result>25</result>