Cut a rope into two sections according to (1/2): (1/3). The first section is known to be 12m. How long is the rope in m?
把一根绳子按(1/2)：(1/3)剪成两段，已知第一段是12m，这根绳子长多少m．
<gadget id="calculator">12 / 3</gadget>
<output>4</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<result>20</result>