The diameter of the front wheel of a car is 1/4 of the diameter of the rear wheel. If the front wheel rotates 36 times, how many times does the rear wheel rotate?
一辆汽车前轮直径是后轮直径的(1/4)，前轮转动36圈，后轮转动多少圈．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">36 * (1/4)</gadget>
<output>9</output>

<result>9</result>