A canal is 530 meters long. It has been repaired for 3 days, and there are 410 meters left to be repaired. How many meters are repaired per day on average?
一条水渠全长530米．已经修了3天，还剩410米没修，平均每天修多少米？
<gadget id="calculator">530 - 410</gadget>
<output>120</output>

<gadget id="calculator">120 / 3</gadget>
<output>40</output>

<result>40</result>