For a children's bicycle, the gear ratio of the front and rear gears is 12:7. If the rear gear rotates 24 times, how many times does the front gear rotate?
一种儿童自行车，前、后齿轮的齿数比是12：7，如果后齿轮转动24圈，那么前齿轮转了多少圈．
<gadget id="calculator">7 * 24</gadget>
<output>168</output>

<gadget id="calculator">168 / 12</gadget>
<output>14</output>

<result>14</result>