The cafeteria originally had 400 kilograms of flour. After eating bag a, each bag is 25 kilograms. How many kilograms of flour are left?
食堂原有400千克面粉，吃掉a袋，每袋25千克，还剩多少千克面粉．
<gadget id="calculator">400 - 25</gadget>
<output>375</output>

<result>375</result>