There are two pencils of the same length, the first one is used up 14 cm, and the second one is used up 2 cm. At this time, the length of the second one is three times that of the first one. How many centimeters are the original pencils?
有两根同样长的铅笔，第一根用去14厘米，第二根用去2厘米后，这时第二根的长度是第一根的3倍，问原有铅笔各多少厘米．
<gadget id="calculator">14 - 2</gadget>
<output>12</output>

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

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

<gadget id="calculator">6 + 14</gadget>
<output>20</output>

<result>20</result>