Pave asphalt for a section of 3,600 meters of road, pave 150 meters per day, according to this calculation, it will take 20.5 days to pave, how many meters are left unpaved?
给一段3600米的公路铺沥青，每天铺150米，照这样计算铺20.5天，还剩多少米没铺？
<gadget id="calculator">150 * 20.5</gadget>
<output>3_075</output>

<gadget id="calculator">3_600 - 3_075</gadget>
<output>525</output>

<result>525</result>