The school cafeteria shipped a batch of grain, including 500 kg of rice and 425 kg of flour. If there is one bag per 25kg, how many fewer bags are there for flour than for rice?
学校食堂运来了一批粮食，其中大米500千克，面粉425千克．如果每25千克装一袋，那么面粉比大米少装多少袋？
<gadget id="calculator">500 / 25</gadget>
<output>20</output>

<gadget id="calculator">425 / 25</gadget>
<output>17</output>

<gadget id="calculator">20 - 17</gadget>
<output>3</output>

<result>3</result>