A road is 680 meters long, 55 meters will be repaired every day for the first 4 days, and the rest will be completed within 8 days. How many meters will be repaired on average every day?
一条公路长680米，前4天每天修55米，余下的要在8天内完成，平均每天要修多少米？
<gadget id="calculator">55 * 4</gadget>
<output>220</output>

<gadget id="calculator">680 - 220</gadget>
<output>460</output>

<gadget id="calculator">460 / 8</gadget>
<output>115/2 = around 57.5</output>

<result>115/2 = around 57.5</result>