The gear ratio of the rear gear to the front gear of a bicycle is 8:13, the front gear has 26 teeth, how many teeth does the rear gear have?
一辆自行车后齿轮与前齿轮的齿数比是8：13，前齿轮有26个齿，后齿轮有多少个齿．
<gadget id="calculator">26 / 13</gadget>
<output>2</output>

<gadget id="calculator">2 * 8</gadget>
<output>16</output>

<result>16</result>