colored ribbon is 15 meters long, and it has been used twice. The first time used is 1m less than the second used (1/3), and the first used 2m. Is this colored ribbon used up? If not used up, how many meters are left?
一条彩带长15米，用了两次，第一次用去的比第二次用去的(1/3)少1m，第一次用去2m，这条彩带用完了吗？如果没用完，还剩几米？
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">3 / (1/3)</gadget>
<output>9</output>

<gadget id="calculator">2 + 9</gadget>
<output>11</output>

<gadget id="calculator">15 - 11</gadget>
<output>4</output>

<result>4</result>