Cars A and B transport a pile of coal together. When the coal is finished, car A has transported 12 tons more than the total (7/15), which is 1/2 more than car B. How many tons has car A transported?
甲、乙两车共运一堆煤，运完时，甲车运了总数的(7/15)还多12吨，比乙车多运(1/2)，甲车运了多少吨？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">12 * (1/2)</gadget>
<output>6</output>

<gadget id="calculator">12 + 12 + 6</gadget>
<output>30</output>

<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">(7/15) * (1/2)</gadget>
<output>7/30 = around 0.233333</output>

<gadget id="calculator">(1/2) - (7/15) - (7/15) - (7/30)</gadget>
<output>-2/3 = around -0.666667</output>

<gadget id="calculator">1 + (-2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">30 / (1/3)</gadget>
<output>90</output>

<gadget id="calculator">90 * (7/15)</gadget>
<output>42</output>

<gadget id="calculator">42 + 12</gadget>
<output>54</output>

<result>54</result>