The school cafeteria bought 0.5 tons of rice and ate an average of 82.5 kilograms per day. After eating for 4 days, how many kilograms of rice are left?
学校食堂买来0.5吨大米，平均每天吃82.5千克，吃了4天后，还剩下多少千克大米？
<gadget id="calculator">0.5 * 1_000</gadget>
<output>500</output>

<gadget id="calculator">82.5 * 4</gadget>
<output>330</output>

<gadget id="calculator">500 - 330</gadget>
<output>170</output>

<result>170</result>