There are two piles of steel, and (1/3) is shipped from the first pile, and 60% is shipped from the second pile, then the rest of the first pile is twice the rest of the second pile. It is known that the first pile of original steel is 9 tons. How many tons of the second pile of original steel?
有两堆钢材，从第一堆运出(1/3)，从第二堆运出60%，那么第一堆剩下的是第二堆剩下的2倍．已知第一堆原有钢材9吨．第二堆原有钢材多少吨？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(2/3) / 2 / (2/5)</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">9 * (5/6)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>