To build a canal, the canal has been built in 8 days (8/15). According to this calculation, how many days will it take to build this canal?
修筑一条水渠，8天已筑了这条水渠的(8/15)．照这样计算，筑完这条水渠共需要多少天？
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(8/15) / 8</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">1 / (1/15)</gadget>
<output>15</output>

<result>15</result>