A pile of coal was transported away with 20 tons, and another 25 tons was transported. At this time, the coal was exactly 110% of the original volume. How many tons does this pile of coal have?
一堆煤运走了20吨，又运来25吨，这时的煤刚好是原来的110%．原来这堆煤共有多少吨？
<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<gadget id="calculator">110 / 100</gadget>
<output>11/10 = around 1.1</output>

<gadget id="calculator">(11/10) - 1</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">5 / (1/10)</gadget>
<output>50</output>

<result>50</result>