A rope is 10 meters long, the first cut (3/5) and the second cut (1/4), what fraction of the total length is left?
一根绳子长10米，第一次截去(3/5)，第二次截去(1/4)，还剩下全长的几分之几？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (3/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<result>3/20 = around 0.15</result>