A road repair team has been repairing an 840-meter-long road for 12 days, with an average of 20 meters per day. If the rest is 25 meters per day, how many days will it take?
一个修路队修一条长840米的公路，已经修了12天，平均每天修20米，剩下的如果每天修25米，还需要用多少天？
<gadget id="calculator">20 * 12</gadget>
<output>240</output>

<gadget id="calculator">840 - 240</gadget>
<output>600</output>

<gadget id="calculator">600 / 25</gadget>
<output>24</output>

<result>24</result>