To build a canal, the full length (1/7) was repaired on the first day, the first day (14/9) was repaired on the second day, the second day (5/4) was repaired on the third day, and the whole length was repaired on the third day How long is it?
修一条水渠，第一天修了全长的(1/7)，第二天修了第一天的(14/9)，第三天修了第二天的(5/4)，第三天修了全长的几分之几？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">14 / 9</gadget>
<output>14/9 = around 1.555556</output>

<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">(1/7) * (14/9) * (5/4)</gadget>
<output>5/18 = around 0.277778</output>

<result>5/18 = around 0.277778</result>