A rope is 20 meters long, 5 meters are used for the first time, and the remaining 2/5 is used for the second time, how many meters are shared between the two times?
一根绳子长20米，第一次用去5米，第二次用去剩下的2/5，两次共用去多少米？
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">15 * (2/5)</gadget>
<output>6</output>

<gadget id="calculator">5 + 6</gadget>
<output>11</output>

<result>11</result>