Xiao Ming used 1/3 of the total money to buy pens and 6 yuan to buy books. At this time, the ratio of the money used to the remaining money is 5:4. How much money does he have left?
小明买钢笔用去总钱数的(1/3)，买书用去6元，这时用去的钱数和剩下钱数的比是5﹕4，他还剩多少钱？
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/9) - (1/3)</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">6 / (2/9)</gadget>
<output>27</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">27 * (4/9)</gadget>
<output>12</output>

<result>12</result>