The front gear of a bicycle has 100 teeth and the rear gear has 30 teeth. If the front gear makes 5 revolutions, how many revolutions does the rear gear make? (Answer with proportional knowledge)
自行车的前齿轮共有100个齿，后齿轮有30个齿，如果前齿轮转5圈，后齿轮转多少圈？(用比例知识解答)
<gadget id="calculator">100 * 5</gadget>
<output>500</output>

<gadget id="calculator">500 / 30</gadget>
<output>50/3 = around 16.666667</output>

<result>50/3 = around 16.666667</result>