A rope, use it on the first day (6/10), use it on the second day (3/10), use it more on the first day than on the second day
一根绳子，第一天用去它的(6/10)，第二天用去它的(3/10)，第一天比第二天多用它的多少
<gadget id="calculator">6 / 10</gadget>
<output>3/5 = around 0.6</output>

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

<gadget id="calculator">(3/5) - (3/10)</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>