When digging a canal, 20% of it was dug on the first day, and the remaining 30% was dug on the second day, leaving 560 meters undug. How long is this canal in meters?
挖一条水渠，第一天挖了20%，第二天挖了剩下的30%，还剩560米没有挖．这条水渠全长多少米？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

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

<gadget id="calculator">(4/5) * (3/10)</gadget>
<output>6/25 = around 0.24</output>

<gadget id="calculator">1 - (1/5) - (6/25)</gadget>
<output>14/25 = around 0.56</output>

<gadget id="calculator">560 / (14/25)</gadget>
<output>1_000</output>

<result>1_000</result>