A rope is 20 meters, 12 meters are used for the first time, 1/5 of the total length is used for the second time, what fraction of the total length is used for the first time?
一根绳20米，第一次用去12米，第二次用去全长的(1/5)，第一次用去全长的几分之几？
<gadget id="calculator">12 / 20</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>