There are 4 bags of flour in two packages of large and small, 75 kg per bag for large bags, and 25 kg for small bags. How many kilograms of flour are there in total?
有大小两种包装的面粉各4袋，大袋每包75千克，小袋每包25千克．一共有多少千克面粉？
<gadget id="calculator">75 + 25</gadget>
<output>100</output>

<gadget id="calculator">100 * 4</gadget>
<output>400</output>

<result>400</result>