A canal is 536 meters long. It has been repaired for 3 days, and there are 452 meters left to be repaired. How many meters are repaired per day on average?
一条水渠全长536米．已经修了3天，还剩452米没修，平均每天修多少米？
<gadget id="calculator">536 - 452</gadget>
<output>84</output>

<gadget id="calculator">84 / 3</gadget>
<output>28</output>

<result>28</result>