To dig a canal, 28% of the total length was dug on the first day, and 30% of the total length was dug on the second day. A total of 870 meters was dug in two days. How long is this canal in meters?
挖一条水渠，第一天挖了全长的28%，第二天挖了全长的30%，两天共挖了870米，这条水渠长多少米？
<gadget id="calculator">28 / 100</gadget>
<output>7/25 = around 0.28</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(7/25) + (3/10)</gadget>
<output>29/50 = around 0.58</output>

<gadget id="calculator">870 / (29/50)</gadget>
<output>1_500</output>

<result>1_500</result>