A road repair team builds a road with a length of 4,200 meters. In the first 15 days, an average of 120 meters will be repaired every day. The rest will be completed in 10 days. How many meters will the rest be repaired on average every day? (solution with equation)
一个修路队，修一条长4200米的公路，前15天平均每天修120米，剩下的要在10天修完，剩下的平均每天要修多少米？(用方程解答)
<gadget id="calculator">120 * 15</gadget>
<output>1_800</output>

<gadget id="calculator">4_200 - 1_800</gadget>
<output>2_400</output>

<gadget id="calculator">2_400 / 10</gadget>
<output>240</output>

<result>240</result>