The factory shipped 120 tons of coal in November, 25% of the coal was used in the first ten days, the remaining 60% was used in the middle ten days, and the rest was used up in the second ten days. How many tons of coal can be used on average in the second ten days?
工厂11月份运来120吨煤，上旬用去这批煤的25%，中旬用去余下的60%，剩下的在下旬用完，下旬平均每天可用煤多少吨？
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/5) / 10</gadget>
<output>1/25 = around 0.04</output>

<gadget id="calculator">120 * (3/4) * (1/25)</gadget>
<output>18/5 = around 3.6</output>

<result>18/5 = around 3.6</result>