Xinghua Village built a canal, 45 meters a day, and it has been repaired for 28 days, and 420 meters will be repaired. What is the total length of the canal?
兴华村修一条水渠，每天修45米，已经修了28天，还要修420米，水渠全长多少米．
<gadget id="calculator">45 * 28</gadget>
<output>1_260</output>

<gadget id="calculator">1_260 + 420</gadget>
<output>1_680</output>

<result>1_680</result>