The rice store originally had 20 bags of rice, and each bag of rice was 25 kilograms. After selling half of the rice, how many kilograms are left?
米店原有大米20袋，每袋大米25千克，卖出一半后，还剩多少千克？
<gadget id="calculator">20 / 2</gadget>
<output>10</output>

<gadget id="calculator">10 * 25</gadget>
<output>250</output>

<result>250</result>