Two ropes are 12 meters and 9 meters long respectively. After cutting off a section of the same length, the short section is 1/3 of the long section. How many meters is the long section now?
两根绳子分别长12米和9米，各剪去同样长的一段后，短的一段是长的一段的(1/3)，长的一段现在多少米．
<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<gadget id="calculator">27 - 12</gadget>
<output>15</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">15 / 2</gadget>
<output>15/2 = around 7.5</output>

<gadget id="calculator">12 - (15/2)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>