A 1,800-meter-long Zhifu Road was built in the East Village. In the first week, 395 meters were built, and in the second week, 505 meters were repaired. The rest will be completed in 2 weeks. How many meters will be repaired on average per week?
东村修一条长1800米的致富路，第一周修了395米，第二周修了505米，剩下的要2周修完，平均每周要修多少米？
<gadget id="calculator">1_800 - 395 - 505</gadget>
<output>900</output>

<gadget id="calculator">900 / 2</gadget>
<output>450</output>

<result>450</result>