The school cafeteria bought 16 bags of rice and 20 bags of flour. It is known that each bag of rice and flour is 25 kg. How many kilograms less than the flour did the batch of rice bought by the school?
学校食堂买来16袋大米和20袋面粉，已知大米和面粉每袋都是25千克．学校买的这批大米比面粉少多少千克？
<gadget id="calculator">20 - 16</gadget>
<output>4</output>

<gadget id="calculator">4 * 25</gadget>
<output>100</output>

<result>100</result>