There are two piles of coal, A and B. If 12 tons of coal are transported from pile A to pile B, then the two piles of coal will have the same weight; What is the total weight of these two piles of coal?
有甲、乙两堆煤，如果从甲堆运12吨给乙堆，那么两堆煤就一样重；如果从乙堆运12吨给甲堆，那么甲堆煤就是乙堆煤的2倍．这两堆煤共重多少吨．
<gadget id="calculator">12 * 4</gadget>
<output>48</output>

<gadget id="calculator">2 - 1</gadget>
<output>1</output>

<gadget id="calculator">48 / 1</gadget>
<output>48</output>

<gadget id="calculator">48 + 12</gadget>
<output>60</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">60 + 24</gadget>
<output>84</output>

<gadget id="calculator">60 + 84</gadget>
<output>144</output>

<result>144</result>