batch of coal is 1,800 tons, and the car transported all (1/6) in 3 days. According to this calculation, how many days will it take to transport all the remaining coal? (Multiple answers, at least two)
一批煤1800吨，汽车3天运了全部的(1/6)，照这样计算，把余下的煤全部运走，还要多少天？(多种解答，至少两种)
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">(1/6) / 3</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">1_800 * (1/18)</gadget>
<output>100</output>

<gadget id="calculator">1_800 / 100</gadget>
<output>18</output>

<gadget id="calculator">18 - 3</gadget>
<output>15</output>

<result>15</result>