A pile of coal is transported away (1/4) on the first day, and the remaining half is transported away on the second day, and the remaining coal is 10 tons more than the total transported (2/5). How many tons is this pile of coal?
一堆煤，第一天运走(1/4)，第二天运走剩下的一半，最后剩下的煤比共运走的(2/5)多10吨．这堆煤有多少吨？
<gadget id="calculator">1 / 4</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">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(3/4) * (1/2)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(1/4) + (3/8)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(5/8) * (2/5)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4) - (3/8) - (1/4)</gadget>
<output>1/8 = around 0.125</output>

<gadget id="calculator">10 / (1/8)</gadget>
<output>80</output>

<result>80</result>