A pile of coal totaled 2,400 tons, and 40% of this batch of coal was transported in the first 6 days. According to this calculation, how much of the remaining coal will be transported.
一堆煤共2400吨，前6天运去了这批煤的40%，照这样计算，剩下的煤还要多少运完．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

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

<gadget id="calculator">15 - 6</gadget>
<output>9</output>

<result>9</result>