A road is 4,600 meters long and has been repaired for 25 days, averaging 160 meters per day. How much is left unrepaired?
一条公路长4600米，已经修了25天，平均每天修160米，还剩下多少没有修？
<gadget id="calculator">25 * 160</gadget>
<output>4_000</output>

<gadget id="calculator">4_600 - 4_000</gadget>
<output>600</output>

<result>600</result>