To dig a canal, if 15% and 20 meters of the total length are dug every day, then the dug will be completed in 6 days. How long is this canal in meters?
挖一条水渠，如果每天挖全长的15%又20米，那么6天正好挖完．这一条水渠全长多少米？
<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) * 6</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">6 / (1/10)</gadget>
<output>60</output>

<gadget id="calculator">20 * 60</gadget>
<output>1_200</output>

<result>1_200</result>