An engineering team builds a 4,200-meter-long highway, with an average of 75 meters per day in the first 10 days. The remaining requirements are completed within 25 days. How many meters are repaired per day on average? (column equation solution)
一个工程队修筑一条长4200米的公路，前10天平均每天修75米．余下的要求在25天内完成，平均每天要修多少米？(列方程解答)
<gadget id="calculator">75 * 10</gadget>
<output>750</output>

<gadget id="calculator">4_200 - 750</gadget>
<output>3_450</output>

<gadget id="calculator">3_450 / 25</gadget>
<output>138</output>

<result>138</result>