There are two piles of coal with a total of 136 tons. A certain factory takes 30% from pile A and takes away (1/4) from pile B. At this time, the remaining coal in pile B is exactly 13 tons less than 62.5% of the original total. How many tons of coal did this factory take from pile A?
有两堆煤共136吨，某厂从甲堆中取走30%，从乙堆中取走(1/4)，这时乙堆剩下的煤恰好比原来总数的62.5%少13吨，这个厂从甲堆中取走多少吨煤？
<gadget id="calculator">62.5 / 100</gadget>
<output>0.625</output>

<gadget id="calculator">136 * 0.625</gadget>
<output>85</output>

<gadget id="calculator">85 - 13</gadget>
<output>72</output>

<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">72 / (3/4)</gadget>
<output>96</output>

<gadget id="calculator">136 - 96</gadget>
<output>40</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">40 * (3/10)</gadget>
<output>12</output>

<result>12</result>