20% of a pile of coal is transported for the first time, and 42.5 tons are transported for the second time. There is still (3/8) of this pile of coal. How many tons of this pile of coal are there?
一堆煤第一次运走20%，第二次运走42.5吨，还剩下这堆煤的(3/8)，这堆煤有多少吨？
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 - (1/5) - (3/8)</gadget>
<output>17/40 = around 0.425</output>

<gadget id="calculator">42.5 / (17/40)</gadget>
<output>100</output>

<result>100</result>