factory produces a batch of parts and completes the task (3/10) in 6 days. According to this calculation, how many days will it take to complete this batch of tasks? (At least 3 ways to answer)
某工厂生产一批零件，6天完成了任务的(3/10)，照这样计算，完成这批任务还需多少天？(至少用3种方法解答)
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/10) * 6</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">6 - (9/5)</gadget>
<output>21/5 = around 4.2</output>

<gadget id="calculator">(21/5) / (3/10)</gadget>
<output>14</output>

<result>14</result>